Final answer:
Incomplete problem: Insufficient details are provided to determine which combination of boxes of candy and bags of popcorn could be bought.
Step-by-step explanation:
The problem seems to be incomplete as there isn't enough information provided to determine which combination of boxes of candy and bags of popcorn the group could buy. For a complete solution, key details like the budget limit, the cost of each box of candy and bag of popcorn, or the total number of items needed should be provided. To solve such problems generally, one would set up an equation or system of equations based on given constraints (like budget or quantity) and solve for the possible combinations of items that meet those constraints.