Task: Question Answering
Input (English): Question: N persons stand on the circumference of a circle at distinct points. Each possible pair of persons, not standing next to each other, sings a two-minute song one pair after the other. If the total time taken for singing is 28 minutes, what is N?

 Option A: 5

 Option B: 7

 Option C: 9

 Option D: None

 Option E: Cannot be determined
Output (English): Option B