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:

The workers are hell bent at getting what is due to them.

A hell bent on getting

B hell bent for getting

C hell bent upon getting

D No improvement

ANS:C - hell bent upon getting

No answer description is available.