Divide and Simplify $\frac{z^{2}+12 z+35}{z^{2}+14 z+49} \div \frac{z^{2}+5 z}{z^{2}+4 z-21}$ A) $\frac{z-3}{z^{2}+7 z}$

Multiple Choice

Divide and simplify.
- $\frac{z^{2}+12 z+35}{z^{2}+14 z+49} \div \frac{z^{2}+5 z}{z^{2}+4 z-21}$

A) $\frac{z-3}{z^{2}+7 z}$
B) $\frac{z}{z^{2}+14 z+49}$
C) $\frac{z-3}{z}$
D) $\mathrm{z}-3$