Find (If Possible) the Supplement Of $\frac { 3 \pi } { 4 }$

Multiple Choice

Find (if possible) the supplement of $\frac { 3 \pi } { 4 }$ .

A) $\frac { 3 \pi } { 8 }$
B) $\frac { 7 \pi } { 8 }$
C) $\frac { \pi } { 4 }$
D) $\frac { 5 \pi } { 16 }$
E) not possible