Find that part of the sentence that contains the error. If there are no errors, choose D as your answer.
I don’t want to loose contact with my school friends.

Sometimes a verb is confused with another word which sounds similar but is from a different word class:
I don’t want to lose contact with my school friends.
Not: I don’t want to loose contact with my school friends.
(Lose is a verb. Loose is an adjective, e.g. These shoes are too loose; I need a smaller size.)
Other pairs like this are: advise (verb)/advice (noun), practise (verb)/practice (noun).

Source: Cambridge Dictionary