Correct Answer: Cat : Mouse

Solution : Given:
Bird : Worm :: ? (This depicts the relation between an animal and the food it consumes.)

Let's check the options –
First option: Trap : Cheese; Cheese is a food item but Trap is not an animal.
Second option: Lion : Cave; A cave is the shelter for a lion.
Third option: Cat : Mouse; Cat is an animal and the mouse is what it consumes.
Fourth option: Horse : Stable; A stable is the shelter for a horse.

So, only the third option follows the same pattern as followed by the given pair of words. Hence, the third option is correct.