Determine the Ratio and Write It in Lowest Terms $\frac { 8 } { 11 }$

Multiple Choice

Determine the ratio and write it in lowest terms.
-21 people to 15 people

A) $\frac { 8 } { 11 }$
B) $\frac { 11 } { 8 }$
C) $\frac { 7 } { 5 }$
D) $\frac { 5 } { 7 }$