Abusiness chooses to build army tanks rather than butter-making machines, bread machines, or candy vending machines. what are these other alternatives called?
a. opportunity costs
b. trade-off
c. scarcity
d. none of the above

What explains the increase in life expectancy in botswana? a. the increased availability of jobs and an improved economy b. access to antiretroviral drugs, hiv/aids education, and widespread hiv/aids testing c. a series of military takeovers that stabilized the political system and led to education reform and increased literacy rates d. a recent military coup that led to an improved healthcare system select the best answer from the choices provided.