It's wrong because opponents are in a competitive relationship.
This justifies what answer for what question? Q & A: 
Choose the sentence that goes against common sense.
Options:
- Sentence A: "Kate and her partner help each other."
- Sentence B: "Kate and her opponent help each other."

Sentence B
It's wrong because opponents are in a competitive relationship.
This justifies what answer for what question? Q & A: 
user
Choose the sentence that goes against common sense.
Options:
- Sentence A: "Kate and her partner help each other."
- Sentence B: "Kate and her opponent help each other."

Sentence B
assistant
It's wrong because opponents are in a competitive relationship.
This justifies what answer for what question? Q & A: 
Choose the sentence that goes against common sense.
Options:
- Sentence A: "Kate and her partner help each other."
- Sentence B: "Kate and her opponent help each other."

Sentence B