Based on socio-emotional development analysis, Activity Theory is defined to be the theory that states that the more active and involved older adults are, the more likely they are to be satisfied with their lives.
Activity theory was initially propounded by Robert J. Havighurst in 1961.
It assists in studying the positive relationships between life satisfaction and human activities, especially during old age.
Activity theory concluded that older people who perform various activities at old age tend to have good feelings about their lives and helps them to adjust to retirement.
Activity theory is sometimes referred to as implicit theory of aging, normal theory of aging, or lay theory of aging.
Hence, in this case, it is concluded that the correct answer is "Activity Theory."
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