$\text { Evaluate the definite integral } \int _ { 0 } ^ { \pi } 4 \sin ^ { 7 } t \cos t d t \text {. }$

$\text { Evaluate the definite integral } \int _ { 0 } ^ { \pi } 4 \sin ^ { 7 } t \cos t d t \text {. }$

A) 4
B) 7
C) 5
D) 0
E) 8