Most of the people of India are associated with the primary sector of the economy. This is because India has a large population which is engaged in the agricultural activities, fishing, mining, etc. Nearly 49% of the population are employed in this sector.

The correct answer is option 'A' - Primary sector.

Primary sector refers to the sector of the economy that is involved in the extraction and production of natural resources. It includes activities such as agriculture, forestry, fishing, mining, and quarrying. This sector plays a crucial role in the Indian economy and employs the largest number of people in the country. Here is a detailed explanation of why the primary sector is the largest employer in India:

1. Importance of Agriculture:
- India is primarily an agrarian economy, with a significant portion of its population living in rural areas and dependent on agriculture for their livelihood.
- Agriculture contributes a considerable share to the country's GDP and is a major source of income for millions of farmers.
- The cultivation of crops, rearing of livestock, and allied activities like dairy farming and poultry farming fall under the primary sector.

2. Population Distribution:
- India has a vast population, and a significant portion of the population is engaged in agricultural activities.
- The majority of rural households in India rely on agricultural activities for their sustenance.
- Due to limited opportunities in other sectors, many people in rural areas are dependent on agriculture for employment.

3. Lack of Industrialization:
- India's industrial sector, which falls under the secondary sector, has not developed to its full potential compared to other countries.
- The limited industrialization has resulted in a shortage of job opportunities in the secondary sector, making the primary sector the primary source of employment for a large number of people.

4. Technological Advancements:
- Although there have been advancements in agricultural technology, the primary sector still requires a significant amount of manual labor.
- Farming activities, such as sowing seeds, plowing fields, and harvesting crops, often require a large workforce.
- As a result, the primary sector continues to employ a substantial number of people.

5. Government Initiatives:
- The government of India has implemented various schemes and programs to support the agricultural sector and improve the income of farmers.
- These initiatives aim to enhance agricultural productivity, provide financial assistance, and promote rural development.
- Such efforts further contribute to the employment generation in the primary sector.

In conclusion, the primary sector, particularly agriculture, employs the largest number of people in India due to its significance in the country's economy, population distribution, limited industrialization, technological requirements, and government support.