Question

One should ______ ones bad habits.

The correct phrasal verb to be used here is

A) give on B) give away

C) give up D) given off​

Answer 1

One should C. give up one's bad habits.

Meaning of the phrase "Give Up":

• To surrender or yield possession of something or someone.
• To desist from doing something.
• To declare someone is uncurable or some problem is insoluble.

When to use this phrase: Examples

• To give up on somebody:- She still didn't want to give up on him.
• To give something up:- She didn't give up on her career even after she got married.
• To give something up to someone:- We had the give our certificates up to the authorities.
• To give up yourself(offer):- She gave herself up to the police quite easily.

Hence the answer should be the phrase "give up".