Evaluate the Integral $\int _ { 0 } ^ { 1 } 9 x \sin \pi x d x$

Multiple Choice

Evaluate the integral. $\int _ { 0 } ^ { 1 } 9 x \sin \pi x d x$

A) $2.8665$
B) $6.5700$
C) $0.7166$
D) $11.8665$
E) None of these