The correct option is A 1
There are 36 pens.
Total friends among which pens are to be distributed = 5
Let us apply repeated subtraction.
36 - 5 = 31
31 - 5 = 26
26 - 5 = 21
21 - 5 = 16
16 - 5 = 11
11 - 5 = 6
6 - 5 = 1
Thus, after distributing 36 pens equally among 5 friends, Ravi will be left with 1 pen.