I would appreciate __ if you could attend the meeting.

• A. That
• B. This
• C. Me
• D. It

Answer: (D)

Using a dummy pronoun to introduce a polite request. In this sentence, the natural filler is it because English often uses the structure “I would appreciate it if + subject + could + verb” to make a formal request. Here, “it” doesn’t refer to a person or thing; it stands in for the entire clause that follows—the idea of you attending the meeting. That makes the sentence smooth and grammatically correct: “I would appreciate it if you could attend the meeting.”

Other options don’t fit this idiom. That and this aren’t used as the placeholder for the following clause in this construction, and me would be ungrammatical in this position. So the best choice is the pronoun that serves as the formal, nonspecific subject placeholder for the upcoming clause.