A business chooses to build army tanks rather than butter-making machines. What is this called?

a. factors of production

b. trade-off

c. scarcity.

d. none of the above

This would be called a trade-of B.

The reason why this is correct is because if you can only build one thing as a company and you decide that building war equipment is more important to you, then you're doing a trade-off between building butter-making machines and army tanks.