The question tests the understanding of verb moods and tenses in English grammar. The correct answer is D, as the Present Subjunctive Mood is used to express wishes, hypothetical situations, or situations that are not true in the present. Option A is incorrect because the Present Simple Tense is used to describe facts or habits. Option B is incorrect because the Past Perfect Tense is used to describe actions that were completed before another past action. Option C is incorrect because the Future Perfect Tense is used to describe actions that will be completed before a certain point in the future.