Task: Question Answering
Input (English): Question: A die is thrown twice and the sum of the numbers appearing is observed to be 6.
find the conditional probability that the number 4 has appeared at least once?

 Option A: 3/5

 Option B: 3/7

 Option C: 2/5

 Option D: 3/11

 Option E: 3/13
Output (English): Option C