Use the Rules of Exponents to Simplify the Expression $\frac{y^{9 / 8}}{y^{5 / 8}}$

Multiple Choice

Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers.
- $\frac{y^{9 / 8}}{y^{5 / 8}}$

A) $y^{1 / 2}$

B) $\frac{1}{y}$

C) $y$

D) $y^{9 / 8}$