Topic: Synonyms,

Best Answer Explained in Below-:

The phrase "He could not deny that" implies an acknowledgment or acceptance of a fact or reality that is indisputable. To "deny" something means to refuse to accept that it is true or valid. In this context, option D, "refuse," aligns closely with the concept of denial, as it denotes an active rejection of a statement or truth.

On the other hand, each of the other options does not fit as seamlessly with the meaning of the phrase. Option A, "decide," suggests a choice or resolution which does not relate directly to the notion of denial. Option B, "accept," might seem relevant but actually contrasts with the phrase since acceptance involves recognizing something as true rather than denying it. Lastly, option C, "confusion," indicates a state of uncertainty or lack of clarity, which does not directly correspond to the action of denying a fact.

Thus, "refuse" is the most appropriate choice because it encapsulates the core idea of rejecting or negating information, which is the essence of denial.