In the given context, the sentence refers to the past perfect
tense as it mentions ‘before’. This is correct as the past perfect tense indicates
a completed action which had taken place before another event took place. Option
C follows the pattern Subject + Had + V2 + Object. Thus, this is the correct
answer.
“Meets” in option A refers to simple present tense as it indicates general
habits or truth. This does not concur with the structure of the rest of the
sentence.
“Has been” in option B is used in present perfect continuous tense and the verb
+ ing form is used with it. Thus, this is also incorrect.
“Was met” in option D is also incorrect as was + V2 + him/her is grammatically
incorrect. “Was met” is generally used to indicate a situation where a person
is picked up by someone on arrival or a situation a person finds on arrival.
Thus, option C is the correct answer.