20, 20, 19, 16, 17, 13, 14, 11, ?, ?

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.