Subtract the Fractions Below, and Express the Answer in Its $\frac { 4 } { 7 } - \frac { 1 } { 7 }$

Multiple Choice

Subtract the fractions below, and express the answer in its lowest terms. $\frac { 4 } { 7 } - \frac { 1 } { 7 }$

A) $\frac { 5 } { 7 }$
B) $\frac { 3 } { 7 }$
C) $\frac { 3 } { 14 }$
D) $\frac { 5 } { 14 }$
E) none of these