Task: Question Answering
Input (English): Question: If a·b·c·d=510, where a, b, c and d are positive integers, and a<b<c<d, which of the following could be the value of d−a?

 Option A: 9

 Option B: 10

 Option C: 11

 Option D: 13

 Option E: 15
Output (English): Option E