You should use Affinity Audiences to reach outdoor enthusiasts with your Google Video campaign.

• Life Events
• Custom Audiences
• Affinity Audiences 
• Demographics and Detailed Demographics

The correct answer is: Affinity Audiences

Explanation: To reach outdoor enthusiasts with your Google Video campaign, you should use Affinity audiences. This audience solution captures a comprehensive picture of a person’s interests, lifestyle, and consumption habits, and helps deliver high-accuracy segments. Affinity audiences can help you raise awareness and drive consideration among people who have a strong interest in your products. By pairing an affinity audience like “Outdoor Enthusiast” with camping-related keywords, you can reach people who are not only searching for camping products, but are also passionate about the great outdoors. Affinity segments allow you to reach the people who matter most with your products or offerings.