If the arithmetic mean of the series $$a_1, a_2, ... a_n$$ is A and the arithmetic mean of the series $$b_1, b_2, ... b_n$$ is B, then the arithmetic mean of the series
$$a_1 + b_1, a_2 + b_2, ..., a_n + b_n$$ is

A

$$\frac{A + B}{2}$$

B

$$A + B$$

C

$$2(A + B)$$

D

$$\frac{A + B}{n}$$