Task: Question Answering
Input (English): Question: If each and every term in the sum a1+a2+a3+.....+an is either 7 or 77 and the sum equals 350, which of the following could be equal to n?

 Option A: 38

 Option B: 39

 Option C: 40

 Option D: 41

 Option E: 42
Output (English): Option C