Clancy is training for a triathlon, a timed race that combines swimming, biking, and running. Consider the following sentence: Clancy has only 20 hours this week that he can devote to training. Each hour he spends swimming is an hour that he can't spend biking or running. Which basic principle of individual choice do these statements best illustrate? a. Maria has an incentive to spend more time on swimming than on biking or running.
b. People usually exploit opportunities to make themselves better off.
c. Maria can use lime most efficiently by spending the same amounts of time on swimming, biking, and running.
d. People face trade-offs

d. People face trade-offs

Explanation:

Since maria has 20 hours training in a week and the training consist of swimming, biking and running also she is not able to do three at the same time so for approaching these 3 different time she will engaged i.e. she trade off the time between these three things.

So, she sacrifice some time for each kind of the activity therefore the correct option is d.

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