Correct Answer:
B. over
The correct answer is over. The preposition 'over' is used to indicate movement from one side of something to the other, often implying movement above or across an obstacle. When a cat jumps 'over' a wall, it means it clears the wall by going above it to land on the other side. This accurately describes the action of an animal traversing a barrier.
Let's analyze why the other options are incorrect:
- On: 'On' indicates a position of contact with a surface. If the cat jumped 'on' the wall, it would mean it landed on top of the wall and stayed there, not that it crossed it.
- At: 'At' typically indicates a specific location or direction towards something. If the cat jumped 'at' the wall, it would suggest jumping towards it, possibly hitting it, but not necessarily clearing it or going to the other side. It doesn't convey the idea of successful traversal.
- For: 'For' indicates purpose, duration, or recipient. It makes no grammatical or logical sense in this context. The cat did not jump 'for' the wall; it jumped to cross it.
Therefore, 'over' is the only preposition that correctly conveys the action of the cat successfully clearing the wall and moving to the other side.