Usage of the word "prefer"

[Foker]

English Grammar Tests, Elementary Level

ESL/EFL Test #50 "Elementary Grammar Questions", question 2

My ......... colour is green.

(a) preferred
(b) like
(c) most liked
(d) favourite

English Grammar Tests, Elementary Level

ESL/EFL Test #50 "Elementary Grammar Questions", answer 2

My favourite colour is green.

Correct answer: (d) favourite

Your answer was: correct
_________________________

I just want to know the usage of the word "prefer"

Foker

[Conchita]

'To prefer' means 'to like (to do) something better than something else':

I would prefer to stay indoors and watch television.
Which do you prefer -- chocolate or vanilla ice-cream?
She prefers tea to coffee.