To find the unit rate of rolled oats per cup of almonds, we need to divide the amount of rolled oats by the amount of almonds.
Maria uses 6 cups of rolled oats and 2 cups of almonds:
\[ \text{Unit Rate} = \frac{\text{Cups of Rolled Oats}}{\text{Cups of Almonds}} = \frac{6 \text{ cups}}{2 \text{ cups}} = 3 \]
So, the unit rate is 3 cups of rolled oats per cup of almonds.
The correct response is 3 cups.