Multiply Do Not Simplify $\frac{7 y^{4}}{7 y^{4}} \cdot \frac{2 z}{7 x}$

Multiple Choice

Multiply. Do not simplify.
- $\frac{7 y^{4}}{7 y^{4}} \cdot \frac{2 z}{7 x}$

A) $\frac{2 z}{\left(7 y^{4}\right) (7 x) }$
B) $\frac{\left(7 y^{4}\right) (7 x) }{\left(7 y^{4}\right) (2 z) }$
C) $\frac{\left(7 y^{4}\right) (2 z) }{7 x}$
D) $\frac{\left(7 y^{4}\right) (2 z) }{\left(7 y^{4}\right) (7 x) }$