Direction: In the following questions, a part of the sentence is printed in bold. Below are given alternatives to the bold part at (1), (2) and (3) which may improve the sentence. Choose the correct alternative.In case no improvement is needed your answer is (4).

He has been growing weaker and his life now hangs with a thread

Options

A. on
B. to
C. by
D. No Improvement

Answer

C

Explanation

(3) hang by a thread (Idiom) : to be in great danger
Hence, by (Prep.) is the right usage.