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:

She says she's already paid me back, but I can't remember, so I 'll have to take her word.

A to take her word true

B to take her at her word

C to take her word for it

D No improvement

ANS:B - to take her at her word

No answer description is available.