Convert the Angle in Degrees to Radians $\pi .$ -160° A) $\frac { 7 \pi } { 8 }$

Multiple Choice

Convert the angle in degrees to radians. Express the answer as multiple of $\pi .$
-160° A) $\frac { 7 \pi } { 8 }$
B) $\frac { 8 \pi } { 9 }$
C) $\frac { 9 \pi } { 10 }$
D) $\frac { 9 \pi } { 8 }$