DIRECTIONS: in the following question, a part of sentence is bold. Below are given alternatives to the bold part which may improve the sentence. Choose the correct alternative. In case no improvement is required, choose “No Improvement” option.
Sincere workers do not rest till they have reached perfection in their work.

Options

A. A) they had achieved
B. B) they have achieved
C. C) they having reached
D. D) No Improvement

Answer

B

Explanation

Here, they have achieved (attained) is the right usage.