Taran ranked 28th from the top and 64th from the bottom in his class. How many students are there in his class?

Given: 

Taran ranked 28th from the top and 64th from the bottom in his class.

Total = Rank from top + Rank from bottom − 1

Total = 28 + 64 − 1 = 91

So, 91 students are there in his class.

Thus, correct option is (d).