Primary Road Systems of Our Country:
There are several primary road systems in our country that are crucial for transportation and connectivity. The main ones include:
National Highways:
- National Highways form the backbone of the road network in our country.
- They are maintained and managed by the National Highways Authority of India (NHAI).
- These highways connect major cities, capitals, and important economic hubs across the country.
- They have a high capacity for traffic and are built to national standards.
State Highways:
- State Highways are maintained and managed by the respective state governments.
- They connect important cities and towns within a particular state.
- State Highways are crucial for intra-state transportation and are usually wider and better maintained than district roads.
District Roads:
- District Roads are maintained and managed by the district administrations.
- They connect villages, towns, and smaller cities within a district.
- These roads are important for local transportation and providing connectivity to remote areas.
Border Roads:
- Border Roads are strategic roads constructed and maintained by the Border Roads Organization (BRO).
- These roads are crucial for maintaining and enhancing connectivity in border areas.
- Border Roads help in facilitating the movement of troops, supplies, and development activities in border regions.
In conclusion, the primary road systems of our country include National Highways, State Highways, District Roads, and Border Roads. These road networks play a vital role in connecting various parts of the country, promoting trade and transportation, and ensuring overall development.

Primary road systems in our country include National Highways, State Highways, District roads, and Border roads. However, the correct answer is option 'A' - National Highways.

National Highways:
- National Highways are the primary road network in our country and are managed by the central government through the National Highways Authority of India (NHAI).
- These highways connect major cities, state capitals, ports, and other important locations across the country.
- National Highways are classified into different categories based on their importance and traffic volume. For example, the Golden Quadrilateral connects the four major metropolitan cities of Delhi, Mumbai, Chennai, and Kolkata.

State Highways:
- State Highways are maintained and managed by the respective state governments.
- These roads connect important cities, towns, and tourist destinations within a state.
- State Highways also serve as a link between National Highways and district roads.

District roads:
- District roads are maintained by the district administrations.
- These roads connect villages, small towns, and other rural areas within a district.
- District roads are crucial for local transportation, agriculture, and rural development.

Border roads:
- Border roads refer to the roads that are constructed and maintained by the Border Roads Organization (BRO).
- These roads are strategically important as they connect remote areas near the borders with neighboring countries.
- Border roads facilitate the movement of troops, supplies, and development activities in border regions.

In summary, while all the options mentioned are important road systems in our country, the primary road system is the National Highways network. These highways connect major cities and are managed by the central government through the NHAI. State Highways, District roads, and Border roads are also crucial for transportation and development, but they are not considered the primary road systems at a national level.