Dmitri is training for a biathlon, a winter racing sport that combines cross-country skiing and rifle shooting.
Consider the following scenario: Dmitri has only hours available to devote to his training this week. Each hour he spends skiing is one hour that
cannot be spent working onhis shooting.
Which basic principle of individual choice do these statements best illustrate?
a. Dmitri can use time most efficiently by spending the same amounts of time on skiing and shooting.
b. People face tradeoffs.
c. Dmitri has an incentive to spend more time on skiing than on shooting.
d. People usually exploit opportunities to make themselves better off.