The correct answer is B. Research that fruit has the same amount of sugar as candy
Explanation:
The purpose of addressing a counterclaim is to provide evidence or reasons to disprove the counterclaim and in this way support the main claim. This implies to address the counterclaim it is necessary to show how selling fruit instead of candy is not healthy, as the counterclaim states fruit is better "because it is healthier".
According to this, the best evidence to do this is "Research that fruit has the same amount of sugar as candy" because this disproves the counterclaim by showing the amount of sugar in both elements is similar which shows fruit is not healthier than candy and therefore selling candy is the best option.
