Correct Answer: Agriculture

Solution : The correct answer is (a) Agriculture

Agriculture has been a significant source of employment in rural areas, involving activities such as farming, livestock rearing, and fisheries.

However, it's important to note that employment shares across sectors can change over time due to various factors, including economic development, technological advancements, and policy changes. The services sector (option c) has been growing rapidly in recent years and is also a significant contributor to employment in India, particularly in urban areas.