Question

Rationalize the denominator of
\[\sqrt{245x ^{3}y ^{7}}\div \sqrt{5xy ^{8}}\]
Assume that all variables are positive

A. \[49x ^{4}\sqrt{y}\div y\]
B.\[7x \sqrt{y}\div y\]
C. \[\sqrt{1225x ^{4}y ^{15}}\div \sqrt{5xy ^{8}}\]
D.\[\sqrt{49x ^{2}}\div \sqrt{y}\]