Add or Subtract as Indicated $\frac { 1 } { 7 } - \frac { 1 } { 11 }$

Multiple Choice

Add or subtract as indicated.
- $\frac { 1 } { 7 } - \frac { 1 } { 11 }$

A) $\frac { 1 } { 77 }$
B) $\frac { 4 } { 7 }$
C) $\frac { 1 } { 7 }$
D) $\frac { 4 } { 77 }$