Task: Question Answering
Input (English): Question: There are n cities. What is the number of airlines that connected 3 different cities (airline from city A to city B is different with airline from city B to city A)?

 Option A: n(n-1

 Option B: n(n+1

 Option C: n(n-1

 Option D: n(n+1

 Option E: n(n-2
Output (English): Option E