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If f:R to R satisfies f(x+y)=f(x)+f(y),...

If `f:R to R ` satisfies f(x+y)=f(x)+f(y), for all x, y `in` R and f(1)=7, then `sum_(r=1)^(n)f( r)` is

A

`(7n(n+1))/(2)`

B

`(7n)/(2)`

C

`(7(n+1))/(2)`

D

7n + (n+ 1)

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The correct Answer is:
A
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