For $$n \geq 1$$, let $$x_n = r$$ where r is the remainder when n is divided by 7 (for instance, $$x_{24} = 3$$ since 24 leaves remainder 3 when divided by 7). The mode of the observations $$x_5, x_9, x_{11}, x_{13}, x_{16}, x_{21}, x_{23}, x_{25}$$ is

A

0

B

1

C

2

D

4