1. Given that the average of the data $x_{1}, x_{2}, x_{3}$ is $a$, and the average of $y_{1}, y_{2}, y_{3}$ is $b$. Then the average of the data $2 x_{1}+3 y_{1}, 2 x_{2}+3 y_{2}, 2 x_{3}+$ $3 y_{3}$ is ( ).
(A) $2 a+3 b$
(B) $\frac{2}{3} a+b$
(C) $6 a+9 b$
(D) $2 a+b$
$-1 . \mathrm{A}$