Write as a Common Fraction $0.5$ A) $\frac { 1 } { 20 }$

Write as a common fraction.
- $0.5$

A) $\frac { 1 } { 20 }$
B) $\frac { 5 } { 11 }$
C) $\frac { 1 } { 2 }$
D) $\frac { 5 } { 9 }$