To find the unit rate of muffins per cup of almonds, you simply divide the total number of muffins by the total number of cups of almonds used.
Manny makes 36 muffins using 4 cups of almonds.
Unit rate = Total muffins / Total cups of almonds
Unit rate = 36 muffins / 4 cups = 9 muffins per cup of almonds.
So, the correct answer is 9 muffins.