In statement given below, a part of the sentence is enclosed in quotation marks. Below are given alternatives to the quotes part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.When it was feared that the serfs might go too far and gain their freedom from serfdom, the protestant leaders joined the princes "at crushing" them.

• A. into crushing
• B. in crushing
• C. without crushing
• D. No improvement