Sentence Improvement - Verbal and Reasoning

Directions to SolveIn questions given below, a part of the sentence isitalicised and underlined. Below are given alternatives to the italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.
Q1:

It became clear that the strangers were heading into a serious disaster.

A along

B towards

C for

D No improvement

ANS:B - towards

No answer description is available.