According to 2011 census, male population of Assam is

The correct answer is B. 1,68,78,491.

According to the 2011 census, the total population of Assam was 3,11,69,272. The male population was 1,68,78,491 and the female population was 1,42,90,781. The sex ratio was 958 females per 1000 males.

Option A is incorrect. The male population of Assam in 2011 was not 1,59,39,443.

Option C is incorrect. The male population of Assam in 2011 was not 1,87,77,037.

Option D is incorrect. The male population of Assam in 2011 was not none of these.