Complete the sentence with the most suitable option:
His father, _____________________, said he didn't like to work.
Adjective Clauses are dependent clauses which modify a noun or a pronoun, beginning with words like “who”. Since the word Brando, i.e. a person is to be modified, the clause starting with “who” should be used. Hence, Option D is correct. The rest of the options do not adhere to the rule, hence incorrect.