What is the smallest number of birds that could fly in the formation described below, assuming that each bird is counted only once to fulfil all the conditions listed?
Two birds in front of a bird, two birds behind a bird and a bird between two birds.

Correct option is A

The situation described:
Two birds in front of a bird.

Two birds behind a bird.

A bird between two birds.

Thus, the after combine the above-

Thus, the total bird = 2 + 1 + 2 = 5.
So, the correct answer is (a) 5