Final answer:
The airfare is not deductible because the trip was for personal purposes.
Step-by-step explanation:
Kimberly, as a self-employed taxpayer, can deduct a portion of her airfare as a business expense if she can show that the trip had a business purpose. However, since her trip was entirely for personal purposes, she cannot deduct any portion of the airfare.
So, the correct answer is option 1) $0.