Determine the Ratio and Write It in Lowest Terms $\frac { 1 } { 3 }$

Multiple Choice

Determine the ratio and write it in lowest terms.
-18 miles to 6 miles

A) $\frac { 1 } { 3 }$
B) $\frac { 7 } { 19 }$
C) $\frac { 19 } { 7 }$
D) $\frac { 3 } { 1 }$