Answer: Option (b) is correct.
Explanation:
Opportunity cost is the benefit that is foregone for an individual by choosing one alternative over other alternatives available to him.
If the opportunity cost is lower for an individual then this will benefit him whereas if the opportunity cost is higher then this will not benefit the individuals.
The preferences of Pam, Pru and Pat are given. Therefore, according to their preferences, the opportunity cost of the trip to Hawaii for Pam and Pat is a cruise and for Pru is a skiing.