Directions: In the following questions, a sentence is given with five words marked as (A), (B), (C), (D) and (E). These words may or may not be placed in their places. Four options with different arrangements of these words are given. Mark the option with the correct arrangement as the answer. If no change is required, mark 'No arrangement required’ as your answer.

Helping(A) are regarded as the friendliest common(B) in the sea and stories of them creatures(C) drowning dolphins(D) have been sailors(E) since Roman times.