Correct option is A
Given:
· Among six friends, A, B, C, D, E and F, each with a different height.
· B is taller than D but shorter than E.
· C is shorter than E.
· A is taller than F.
· D and E are shorter than C and A, respectively.
· E is shorter than A and F.
From the given information, we get:
A>F>E>C>B>D
So, A is the tallest.
Thus, correct option is (a).