The correct answer is C. 68,70,997.
According to the 2011 census, the total population of Himachal Pradesh is 68,70,997. This makes it the 18th most populous state in India. The sex ratio in Himachal Pradesh is 972 females per 1000 males. The literacy rate in Himachal Pradesh is 82.8%, which is higher than the national average of 74.04%. The main languages spoken in Himachal Pradesh are Hindi, Punjabi, Pahari, and Gaddi. The capital of Himachal Pradesh is Shimla.
Option A is incorrect because the total population of Himachal Pradesh is not 68,64,602.
Option B is incorrect because the total population of Himachal Pradesh is not 56,58,509.
Option D is incorrect because the total population of Himachal Pradesh is not 70,68,997.