Answer: Option (3) is correct.
Explanation:
Correct option: All choices have opportunity costs.
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.
In our case, Neha is training for a triathlon, there are three activities involved in a triathlon and training hours are limited. If Neha wants to spend a hour on swimming then she have to sacrifice training for biking and running for during that time.
Therefore, every choice has an opportunity cost associated with it.