The correct answer is (a) Agriculture field.
According to the 2011 Census of India, 53.1% of the workforce in Uttar Pradesh was engaged in agriculture, followed by 17.2% in industry and 29.7% in services.
Agriculture is the primary occupation of the people of Uttar Pradesh. The state is one of the largest producers of food grains in India. The main crops grown in Uttar Pradesh are rice, wheat, sugarcane, and maize.
The industrial sector in Uttar Pradesh is not as developed as the agricultural sector. However, there are some major industries in the state, such as sugar mills, textile mills, and engineering industries.
The service sector is the fastest growing sector in Uttar Pradesh. The main services provided in the state are education, health care, and tourism.
In conclusion, the maximum percentage of workers in Uttar Pradesh are engaged in agriculture.