Answer
Refrigerator $A$ is the best option
Work Step by Step
In part b) we determine that after $60$ days the costs of owning a refrigerator are equal. Since a person buys a refrigerator for a few years, it is reasonable to choose the option which provides the lowest cost for a long time.
From the solution in part b) we noticed that the most expensive refrigerator ($B$) is the better solution for the first $60$ days, while the cheapest refrigerator ($A$) is the best option after the first $60$ days.
