Write Each Rate or Ratio as a Fraction in Lowest $\frac{3}{4}$

Write each rate or ratio as a fraction in lowest terms.
Change to the same units when necessary.
-Compare in feet: 9 yards to 12 feet.

A) $\frac{3}{4}$
B) $\frac{1}{4}$
C) $\frac{4}{9}$
D) $\frac{9}{4}$