Correct Option: D

According to the provisional population totals in 2001 Census, the literacy rate for Bihar was 47.53% as against 37.49% in 1991 Census as against 37.49% in 1991 Census. Although the literacy rate in the state increased by roughly 10 percentage points during 1991-2001, it was still low as compared to the all India average of 65.38 percent. According to 2011 census, Bihar has lowest rate of literacy (61.8%).