1. Dogs do not bark on the arrival of friends of the family.
2. When A entered B's house, B's dog started barking.

Conclusion:
A is B's enemy.

Question

1. Dogs do not bark on the arrival of friends of the family.  
2. When A entered B's house, B's dog started barking.

Conclusion:
A is B's enemy.

Accepted Answer

From the given statements:  
- It is stated that dogs do not bark at friends of the family but may bark at strangers or first-time visitors.  
- When A entered B's house, the dog barked, indicating that A might be a stranger or visiting for the first time.

However, barking does not necessarily imply enmity. A could be a delivery person or someone unfamiliar to the dog but not necessarily an enemy of B. Therefore, the conclusion that "A is B's enemy" **does not logically follow** from the given statements.

Hence, the correct answer is **(c)**.

Answer

Answer

Answer