Suit me = look well on me
Fit me = be the wrong size for me

B and D are adjectives, not verbs, so they do not match the grammar of the sentence.

If a piece of clothing fits you, it is the right size for your body. Colors have nothing to do with size.

Proper can be used as an adjective or adverb. We need a verb here.

Clothes, colours etc that suit you make you look attractive. Yellow suits you = Yellow makes you look attractive (Correct answer)

Suitable is an adjective.

Hi,

son SonPlease help me choose the best answer and explain when I should use "fit", "proper" and "suit".

Well, yellow doesn't really suit me. ~ Yellow doesn't make me look really attractive.

Fit (when used as a verb) -- to be the right size and shape for (someone or something).

This shirt doesn't fit you. It's too long.

Mister Micawber got me again

Thank you very much!