Task: Question Answering
Input (English): Question: If 8 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes?

 Option A: 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1

 Option B: 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1

 Option C: 8 × 9

 Option D: 28

 Option E: 45
Output (English): Option D