Finish the following sentence with the best choice: How can I keep mosquitoes away?

Choices:
- Killing thyme was found to be 85 to 90 percent effective at repelling mosquitoes.
- Burning thyme was found to be 85 to 90 percent effective at repelling mosquitoes.

Answer:
Burning thyme was found to be 85 to 90 percent effective at repelling mosquitoes.