Find the Missing Number or Expression in Each Pair of Equivalent

Multiple Choice

Find the missing number or expression in each pair of equivalent fraction. Assume there is no zero denominators. $$\frac { 30 x } { 15 x ^ { 2 } } , \frac { 10 } { }$$

A) $X$
B) $2 x$
C) $5 x$
D) $3 x$
E) $4 x$