Correct Answer:
B. over
Explanation:
The correct answer is over because the sentence describes a dynamic movement crossing from one side of a physical barrier to the other.
- Step 1 (Grammatical Analysis): The preposition 'over' is used to show movement from one side of an object to the other side by going above it, which perfectly fits the trajectory of a jumping animal.
- Step 2 (Contextual Application): A cat clears a vertical structure like a wall by leaping through the air over the top of it.
- Incorrect Options:
- on is incorrect because it implies the cat landed and remained stationary on top of the wall surface, rather than completing a full clearance jump.
- at is incorrect because jumping 'at' something implies moving toward it as a target without necessarily crossing it.
- for is incorrect because 'for' indicates a purpose, reason, or destination, which does not fit physical spatial movement across a barrier.