Answer :
The right response is Option C, which refers to assuming adult roles without difficulty.
Adulthood: What Is It?
When a person has reached adulthood, they have reached their entire physical and intellectual potential. Adulthood is often thought of as beginning at age 20 or 21 years. Old age begins around the age of 60 and follows middle age, which starts around the age of 40.
The topic of adult development is briefly discussed after that. See human development and human behavior for a comprehensive discussion.
Physically, early and middle adulthood are characterized by slow, continuous declines in bodily function, which accelerate as one ages. Muscular mass continues to increase till the mid-20s before progressively dropping after that. Skeletal mass increases until age 30 or so, and then begins to diminish, first in the core skeleton (pelvis and spine) and last in the peripheral skeleton (fingers and toes) (fingers and toes). Throughout life, there is a steady buildup of cholesterol in the arteries, and even in the absence of obvious disease, the heart muscle eventually becomes weaker. Although this cannot be directly linked to the steady decline in sexual activity that occurs in both males and females between the ages of 20 and 60, the production of both male and female hormones also declines with age.
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