Answer:
b. an outward shift of the production possibilities curve along both axes
Explanation:
As we know that outward shift refers to the growth.
Baby boomers is a term used for the human generation born between 1946 and 1964 after the end of world war 2 when the birth rate across the world was narrowed and thereafter the emerging births of new infants were known as Baby Boom.
The main reasons of this outward shift were: