If Jesse Can Do a Job in 4 Hours and Mia

If Jesse can do a job in 4 hours and Mia can do the same job in 3 hours, what is the ratio of the rate of work of Jesse to that of Mia?

A) $\frac { 3 } { 4 }$
B) $\frac { 7 } { 3 }$
C) $\frac { 4 } { 3 }$
D) $\frac { 7 } { 4 }$
E) $\frac { 1 } { 3 }$