Simplify the Algebraic Expression by Combining Similar Terms $\frac { 3 } { 5 } n - \frac { 3 } { 4 } n + \frac { 7 } { 10 } n$

Multiple Choice

Simplify the algebraic expression by combining similar terms. $\frac { 3 } { 5 } n - \frac { 3 } { 4 } n + \frac { 7 } { 10 } n$

A) $- \frac { 13 } { 20 } n$
B) $\frac { 20 } { 13 } n$
C) $\frac { 13 } { 20 } n$
D) $\frac { 11 } { 20 } n$
E) $\frac { 20 } { 11 } n$