Task: Question Answering
Input (English): Question: The average of 9 observations was 4, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?

 Option A: 54

 Option B: 12

 Option C: 15

 Option D: 17

 Option E: 18
Output (English): Option A