What is the time complexity of the following iterative method used to find the sum of the first n natural numbers?

[answerhappygod]

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#include<stdio.h>
int get_sum(int n)
{
int sm, i;
for(i = 1; i <= n; i++)
sm += i;
return sm;
}
int main()
{
int n = 10;
int ans = get_sum(n);
printf("%d",ans);
return 0;
}
a) O(1)
b) O(n)
c) O(n2)
d) O(n3)