Final answer:
Option (B), The dependent variable in the situation where 5 pounds of apples cost $6.50 is the cost, as it depends on the quantity of apples purchased.
Step-by-step explanation:
The dependent variable for the situation where 5 pounds of apples cost $6.50 is B. cost. In this context, the cost is dependent on the number of pounds of apples you buy. So, if you change the amount of pounds, the cost will change accordingly. This relationship is similar to the examples given in the chapters, where the amount spent on each fruit is computed by multiplying the quantity by the price per unit.