Alex is training for a triathlon, a timed race that combines swimming, biking, and running. alex has only 20 hours per week that he can devote to training for his race. which basic principle of individual choice does this sentence best illustrate? people usually exploit opportunities to make themselves better off. all costs are opportunity costs. many decisions are made on the margin. resources are scarce.

Resources are scarce.

Explanation:

In making economic decisions we must always realize that resources are scarce. For some of us some resources are not as scarce as they are for others. Time however is one resource that seems scarce for the vast majority of people.

Alex is training for the triathlon which involves 3 different endurance sports and yet he only has 20 hours in a week to do so. This perfectly encapsulates the issue of time scarcity as each of those activities should take hours in a week to be trained for individually and put together will be more and yet he can only offer them 20 hours.

a is the correct answer, tell me if im right

i believe it’s b because the rest don’t make sense