To find out how much cookie dough Maricela will need for 3 1/2 batches of cookies, you can multiply the amount needed for one batch by 3.5 (since she's making 3 1/2 batches):
2 1/3 cups (one batch) * 3.5 (3 1/2 batches) = 8 1/6 cups
So, Maricela will need 8 1/6 cups of cookie dough.
The answer is C. 8 1/6 cups of cookie dough.