Simplify the Algebraic Expression by Combining Similar Terms $\frac { 2 } { 5 } n - \frac { 1 } { 4 } n + \frac { 7 } { 10 } n$

Multiple Choice

Simplify the algebraic expression by combining similar terms. $\frac { 2 } { 5 } n - \frac { 1 } { 4 } n + \frac { 7 } { 10 } n$

A) $\frac { 20 } { 17 } n$
B) $\frac { 17 } { 20 } n$
C) $\frac { 19 } { 20 } n$
D) $- \frac { 19 } { 20 } n$
E) $\frac { 20 } { 19 } n$