10, 10
10, 11
13, 14
13, 16
Answer is Right!
Answer is Wrong!
The answer is $\boxed{\text{A. }10, 10}$.
The sequence is $20, 20, 19, 16, 17, 13, 14, 11, 10, 10, \dots$. It is a simple alternating subtraction sequence, with a difference of $1$ followed by a difference of $3$.
Option A is the only option that follows the pattern of the sequence.