Final answer:
The top four brands, by units sold, for Carey's extreme sports are All Weather Sports, BTFL, Wilsham, and Adidas.
Step-by-step explanation:
The correct answer is option c. All Weather Sports, BTFL, Wilsham, & Adidas.
As per the question, we need to find the top four brands by units sold for Carey's extreme sports.
Looking at option a, Mongoose, BTFL, Hyperlite, and Adidas, we can see that Hyperlite is not mentioned in any of the other options, so it can be eliminated. In option b, Zeato, Adidas, Fox Racing, and Dive and Sail, three out of these four brands are not mentioned in any other options, so this option can be eliminated as well. In option d, Papaison, Hestra, Mongoose, and All Weather Sports, only All Weather Sports is mentioned in option c. Therefore, we can conclude that the top four brands, by units sold, for Carey's extreme sports are All Weather Sports, BTFL, Wilsham, and Adidas.