Final Answer:
To see how many conversions occurred from users in Brazil for the Sports Gear campaign, the trafficker should choose option C: Create a Standard or Floodlight report with location dimensions and Floodlight conversion metrics.
Step-by-step explanation:
Option C is the appropriate choice for tracking conversions based on location. By creating a Standard or Floodlight report with location dimensions, the trafficker can specifically analyze the campaign's performance in Brazil. This allows for a detailed examination of conversion metrics associated with users from Brazil. Options A and B are not directly related to tracking conversions based on location. Option D, visiting the "Floodlight Activities" page and checking Floodlight impressions, provides information on impressions rather than conversions and does not specifically address the geographical aspect of the campaign.
Option C is the answer.