Evaluate the Riemann Sum For $f(r)=36-r^{2}, 0 \leq r \leq 2$

Multiple Choice

Evaluate the Riemann sum for $f(r) =36-r^{2}, 0 \leq r \leq 2$ with four subintervals, taking the sample points to be right endpoints.

A) $68.25$
B) $69.75$
C) $70.75$
D) $70.25$
E) $69.25$