Correct option is A
Given:
Five boys A, B, C, D and E are seated on a bench
A is to the immediate left of C and to the immediate right of B
B is to the immediate right of D
There are exactly two people between C and D
E is to the extreme right end of the row and to the immediate right of C

So, A is seated exactly at the middle of the row.
Hence, the correct answer is 'Option A'.