Question: Which of the following sentences is nonsensical?
Options:
- Sentence A: "thanks to the weakness of his rivals, it's the best chance he never owns to stab them on the back"
- Sentence B: "thanks to the great power of his rivals, it's the best chance he never owns to stab them on the back"

Please answer this question gradually:
If his rivals are powerful, they won't give him a chance to stab them on the back. So the answer is Sentence B.