Answer
First, you could determine which foods the cat will or will not eat. Then you could pick a few of the foods it will eat and place them in identical bowls. Whichever food the cat chooses to eat is the food that the cat most likely prefers.
Work Step by Step
First, you could determine which foods the cat will or will not eat. Then you could pick a few of the foods it will eat and place them in identical bowls. Whichever food the cat chooses to eat is the food that the cat most likely prefers.