If $$\sigma^2$$ is the variance of $$x_1, x_2, ........, x_n$$ then $$9 \sigma^2$$ is the variance of

A

$$4 - 3x_1, 4 - 3x_2, ........, 4 - 3x_n$$

B

$$4 + 9x_1, 4 + 9x_2, ........, 4 + 9x_n$$

C

$$4 - 9x_1, 4 - 9x_2, ........, 4 - 9x_n$$

D

$$4 + 81x_1, 4 + 81x_2, ........, 4 + 81x_n$$