The sentence that uses a purely denotative verb is A. Harry drank three glasses of cranberry juice. Denotative verbs are those that use the meaning of the word directly while connotative words express the meanings of the word in context.
The sentence that uses a purely denotative verb is: Harry drank three glasses of cranberry juice. The correct answer is option A. Denotation means the literal or the dictionary meaning of the word. In the sentence, the verb "drank" is already a verb that conveys its own literal meaning.
I would say A. because communicating is still speaking which individual readers are doing an competence is the able to individually speak. And certain people might having a different speaking structure so that is why I choose A.