In Jharkhand, what percentage of people are engaged in agricultural activities?

The correct answer is B. 30%.

According to the 2011 census, 30.2% of the population of Jharkhand was engaged in agricultural activities. This is lower than the national average of 46.7%. The decline in the percentage of people engaged in agriculture in Jharkhand is due to a number of factors, including the growth of the non-agricultural sector, the migration of people to urban areas, and the mechanization of agriculture.

Option A is incorrect because it is too high. Option C is incorrect because it is too low. Option D is incorrect because it is not a valid percentage.