The correct option is C them
If the pronoun is receiving the action, it is called a direct object. Object pronouns are always used when an antecedent is a direct object. Since the object of the verb is more than one inanimate thing, the answers, third person neuter plural pronoun in the objective, "them" must be used. Hence, Option C is correct. The rest of the options do not adhere to this rule, hence incorrect.