How many year of the civil war passed before president lincoln freed the slaves? in particular which slaves were freed?

What does the law of increasing costs say? a. as you make more and more of one good or service, you will also make more and more of another. b. as you make less and less of one good or service, you will also make less and less another. c. as you make more and more of one good or service, you will make less and less of another. d. there is no change in production levels when you shift from one good or service to another