THE CORRECT ANSWER IS B. Hope this helps :)
Answer:
nebula, protostar, supergiant, supernova, neutron star
It is shared by birth cohorts. It is used in social science to defined
variations in the characteristics of an area of study such as the incidence of
a characteristic or the age at onset, such as year of birth, or year of
exposure to radiation, , over time among
individuals who are defined by some shared brain experience or common life
experience.
