Divide as Indicated, and Express Your Answer in Reduced Form $\frac { 15 } { x } \div \frac { 21 } { y }$

Multiple Choice

Divide as indicated, and express your answer in reduced form. $\frac { 15 } { x } \div \frac { 21 } { y }$

A) $\frac { 5 x } { 7 y }$
B) $\frac { 5 y } { 7 x }$
C) $\frac { 5 } { 7 }$
D) $\frac { 7 x } { 5 y }$
E) $\frac { 7 y } { 5 x }$