How would you expect a drought to influence the ppf for onions​ (on the x​-axis) and other goods and services​ (on the y​-axis)? how would you expect the drought to change the opportunity cost of producing​ onions? a drought that limits onion production would shift the ppf​ _____ and​ _____ the opportunity cost of producing onions.
a. ​inward; decrease
b. ​inward; increase
c. ​outward; decrease
d. ​outward; increase?