Concept:The idea of developmental tasks – key challenges that appear at specific ages – was introduced by Robert Havighurst. He stated that each stage of life has certain tasks that a person must learn and complete.
Explanation:Robert Havighurst first used the term “developmental task” in 1950.
A developmental task arises at a particular period in life and must be solved for healthy progress.
For example, a child must learn to read and a parent must provide for the family.
These tasks are based on social expectations and are common to all individuals at given ages.
Havighurst believed that learning continues throughout life, and each stage presents new tasks.
Thus, the concept clearly belongs to Havighurst.
Answer:B. Havighurst