If 200 people have been working on developing a new community that will feature houses and small businesses what would happen to the PPC of the community if 100 people withdraw from developing the community

What could cause a production possibilities curve to move down and to the left? a.) a nation loses land after being defeated in a war. b.) an increase in the use of computer technology speeds up production c.) a baby boom 20 years ago results in a large number of young adults in the population today. d.) thousands of investors from overseas invest money in a nations economy.