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The value of sum(r=0)^(n) (a+r+ar) (-a)...

The value of `sum_(r=0)^(n)` (a+r+ar) `(-a)^( r)` is equal to

A

a) `(-1)^(n)[(n+1)a^(n+1) -a]`

B

b) `(-1)^(n) (n+1)a^(n+1)`

C

c) `(-1)^(n) ((n+2)a^(n+1))/(2)`

D

d) `(-1)^(n) (na^(n))/(2)`

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