The dog avoids a pet cat. The dog jumps on a sofa. The dog rolls over on command. The dog drools when it smells food.
I gave my students this multiple choice question: Which trait of a pet dog is inherited?

Only one answer is correct among these 4 choices:
- The dog avoids a pet cat.
- The dog jumps on a sofa.
- The dog rolls over on command.
- The dog drools when it smells food.

Could you tell me which one is correct?

The dog drools when it smells food.