Mike, a single and aging war veteran, is increasingly annoyed by "civilians" of all ages. He
makes the girl scouts cry when selling cookies. He ignores all neighborhood barbeque
invitations. His neighbors believe he is lonely until they see him socializing with soldiers. Mike's
special concern of soldiers and excluding civilian's from his circle of care, best characterizes an
unsuccessful resolution of:
a) adolescence
b) young adulthood
c) middle adulthood
d) late adulthood

c) middle adulthood                          

Explanation:

Middle adulthood: In psychology, the term "middle adulthood" is also referred to as "midlife" and is described as a period in an individual's lifespan that occurs between old age and young adulthood. The period of "middle adulthood" starts with the age of twenty years of an individual's life and lasts through forty years of life depending on the degree through which the given tasks, stages, and ages are being culturally defined.

In the question above, the given statement describes the unsuccessful resolution of Mike's middle adulthood as falls in the stagnation period of not being able to contribute or failure in contributing to the outside world.

vertical merger is the term used for the joining of two or more firms involved in different stages of producing the same good or services.

explanation: