Task: Question Answering
Input (English): Question: The sequence x1, x2, x3,..., is such that Xn = 1/n - (1/(n+1)). What is the sum of the first 20 terms of the sequence?

 Option A: 201/100

 Option B: 99/100

 Option C: 100/101

 Option D: 1/10000

 Option E: 20/21
Output (English): Option E