Tìm x biết x chia hết cho 3, x không chia hết cho 9, 20

A. $x\in \left\{23, 24, 25, 26, 27, 28, 29\right\}$

B. $x\in \left\{21,22, 23, 24, 25, 26, 29\right\}$

C. $x\in \left\{21, 24\right\}$

D. $x\in \left\{21, 22, 23, 24, 25, 26, 27, 28, 29\right\}$