Complete the Operation and Simplify If Necessary $- \frac { 3 } { 21 } - \frac { 2 } { 3 }$

Multiple Choice

Complete the operation and simplify if necessary. $- \frac { 3 } { 21 } - \frac { 2 } { 3 }$

A) $- \frac { 17 } { 21 }$
B) $\frac { 11 } { 21 }$
C) $- \frac { 1 } { 21 }$
D) $\frac { 17 } { 21 }$
E) $- \frac { 17 } { 3 }$