Refer to the Following Recipe to Answer the Question $1 \frac{1}{2}$

Refer to the following recipe to answer the question. Give your answer as a mixed numeral.
Grandma's Fork Cookies
$1 \frac{1}{2}$ cup brown sugar
$1 \frac{1}{2}$ cup white sugar
$1 \frac{1}{4}$ cup shortening
1 pinch salt
3 eggs
$2 \frac{1}{2}$ tsp soda
$2 \frac{1}{4}$ tsp cream of tartar
$1 \frac{1}{2}$ tsp vanilla
Cream sugars and shortening. Beat in remaining ingredients. Add flour to stiffen like regular cookie dough. Roll into balls, then flatten with a fork. Cook until brown.
-If the recipe is doubled, how much brown sugar will be needed?

A) 4 cups
B) 3 cups
C) $2 \frac{1}{2}$ cups
D) 5 cups