The sentence that uses an objective case pronoun as a direct object is B, I sent him an attachment that included photos of the picnic.
This is seen as The indirect object "him" identifies to whom the action of the verb sent is performed and thus the sentence uses an objective case pronoun as a direct object
This refers to the direct receiver of an action in a given sentence and this is used to communicate.
Hence, we can see that The sentence that uses an objective case pronoun as a direct object is B, I sent him an attachment that included photos of the picnic.
This is seen as The indirect object "him" identifies to whom the action of the verb sent is performed and thus the sentence uses an objective case pronoun as a direct object
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