Task: Question Answering
Input (English): Question: If a and b are positive numbers, and a^3 + b^3 = 100, then the greatest possible value of a is between:

 Option A: 0 and 3

 Option B: 3 and 4

 Option C: 4 and 5

 Option D: 5 and 7

 Option E: 7 and 9
Output (English): Option C