Complete the sentence with the most suitable option:
Marlon Brando, ________________, is a friend of my fathers.
Adjective Clauses are dependent clauses which modify a noun or a pronoun, beginning with words like “whose”. Since the word Brando, i.e. a person is to be modified, the clause starting with “whose” should be used. Hence, Option A is correct. The rest of the options do not adhere to the rule, hence incorrect.