Explanation:
The term "roads of iron" refers to railway iron tracks, which are used for the construction of railways. This phrase highlights the importance and significance of railroads in transportation and infrastructure development. Here's a detailed explanation:
- Railway iron track: The primary meaning of "roads of iron" is railway iron tracks. These tracks are made of iron or steel and are used for the construction of railways. Railways have played a crucial role in the development of transportation systems, facilitating the movement of goods and people over long distances.
- Silver track: The option of "Silver track" is incorrect as it is not a commonly used term to refer to railway tracks. The phrase "roads of iron" specifically emphasizes the material used for the tracks, which is iron or steel, not silver.
- Roadways: The option of "Roadways" is incorrect. While roadways are indeed a form of transportation infrastructure, "roads of iron" specifically refers to railway tracks, not regular roadways for cars and other vehicles.
- None of these: The option of "None of these" is incorrect because the correct answer is option A, which states that "roads of iron" refers to railway iron tracks.
In conclusion, the phrase "roads of iron" refers to railway iron tracks used for the construction of railways, highlighting the importance of rail transportation in infrastructure development and promoting the movement of goods and people.