For a regular $$k$$-sided polygon, let $$\alpha(k)$$ denote its interior angle. Suppose $$n>4$$ is such that $$\alpha(n-2)$$, $$\alpha(n)$$, $$\alpha(n+3)$$ form an arithmetic progression. The sum of digits of $$n$$ is

A

2

B

3

C

4

D

5