The correct answer is C. 61.80%.
The literacy rate of Bihar is the percentage of the population aged 7 and above who can read and write with understanding in any language. According to the Census of 2011, the literacy rate of Bihar was 61.80%, which was lower than the national average of 74.04%. The literacy rate for males was 73.39% and for females was 49.92%. The literacy rate was higher in urban areas (77.56%) than in rural areas (55.33%).
The low literacy rate in Bihar is due to a number of factors, including poverty, lack of access to education, and gender inequality. The government has taken a number of initiatives to improve the literacy rate in Bihar, including the Sarva Shiksha Abhiyan (SSA) and the Mid-Day Meal Scheme. However, more needs to be done to ensure that all children in Bihar have access to quality education.
Option A is incorrect because the literacy rate of Bihar is not 74.04%. The literacy rate of Bihar is 61.80%.
Option B is incorrect because the literacy rate of Bihar is not 82.14%. The literacy rate of Bihar is 61.80%.
Option D is incorrect because the literacy rate of Bihar is not 51.5%. The literacy rate of Bihar is 61.80%.