Find the synonym of the underline word. 

Jack’s appetite has diminished since his girlfriend once said she hated fat people.

Following are certain steps to find the Correct option:-

Firstly we have to know what is a synonym?

Two words are synonyms if they mean the same things.

Now, we have to look for the word 'appetite'

The appetite refers to the intake of food. now, let's look at the meaning of the other option:-

Choosing option (a) is wrong because diet is related to diet, not exercise. Exercise helps increase your appetite, which means you feel hungry.

Option (b) is wrong because the desire of visitors has nothing to do with appetite.

Option (c) is wrong because the desire for sleep is not related to appetite either.

Now, check which of the above-mentioned option with a suitable word for 'appetite'

The correct synonym for the word 'appetite' is an option (d) desire for food