Write the Ratio as a Fraction in Simplest Form $\frac { 4.5 } { 10 }$

Write the ratio as a fraction in simplest form.
-4.5 to 10

A) $\frac { 4.5 } { 10 }$
B) $\frac { 9 } { 20 }$
C) $\frac { 20 } { 9 }$
D) $\frac { 9 } { 2 }$