Solve Write the Fractions in Simplest Form $\frac { 6400 } { 8000 }$

Multiple Choice

Solve. Write the fractions in simplest form.
-There are 8000 runners at a marathon. If 6400 are male, what fraction of the runners are female ?

A) $\frac { 6400 } { 8000 }$
B) $\frac { 2 } { 8 }$
C) $\frac { 1 } { 5 }$
D) $\frac { 4 } { 5 }$