What must we do regarding shopping?

The correct answer emphasizes a necessity regarding shopping, indicating that it is essential to go to the store. This phrasing implies an obligation or requirement, suggesting that shopping cannot be postponed or ignored. "Have got to" conveys urgency or a strong need, reinforcing the idea that going to the store is necessary in this context.

In comparison, the other responses imply reluctance or an option not to go. Phrases like "should avoid," "can skip," and "would prefer not to" all indicate a choice or recommendation rather than an obligation. They suggest that while one might consider going to the store, there are alternatives or reasons to refrain from it. Thus, the focus on the necessity in the correct answer distinguishes it clearly from the other options, which denote varying degrees of avoidance or preference rather than requirement.