Final answer:
Kristin accidentally added 2 extra cups of water to her cake recipe, where the recipe called for 3 cups and she added 5 cups.
Step-by-step explanation:
Kristin is following a recipe and needs to calculate the amount of extra water she has added. The recipe calls for 3 cups of water, but she has added 5 cups. To find out how many extra cups of water she put in, we subtract the amount required by the recipe from the amount she actually added:
5 cups (added) - 3 cups (recipe) = 2 extra cups of water.
Therefore, the answer to how many extra cups of water Kristin put in is 2 cups, which corresponds to option A.