Task: Question Answering
Input (English): Question: Take a number 'x' and follow these steps :
1. Find the sum of its digit
2. If the sum has only one digit , STOP
3. Else , go back to step 1 with the new number.
If x = 1684 ,what is the end result ?

 Option A: 19

 Option B: 10

 Option C: 1

 Option D: 2

 Option E: None of these
Output (English): Option C