The Circle Graph Shows the Number of Blood Donors of Each

Multiple Choice

The circle graph shows the number of blood donors of each blood type who participated in the previous blood drive at a community college. What is the ratio of donors with type A- blood to those with type O+ blood?

A) $\frac { 1 } { 5 }$
B) $\frac { 2 } { 3 }$
C) $\frac { 1 } { 3 }$
D) $\frac { 5 } { 3 }$
E) $\frac { 3 } { 5 }$