The Production Possibilities Will Definitely Shift Outward If

The production possibilities will definitely shift outward if:

A) Land and capital increase and,at the same time,the labor force decreases.
B) Available resources decrease and,at the same time,technology improves.
C) The labor force increases and,at the same time,technology improves.
D) The labor force decreases and,at the same time,land and capital decrease.