The correct answer is letter A.
Explanation: Observational learning was studied by Albert Bandura (1925-1998), who developed several experiments to substantiate his theory.
According to Bandura, social learning occurs by observing the behaviors of those with whom we live (parents, friends, teachers). Bandura refers to modeling as the social learning process based on social observation and imitation.
Based on the options given, the answer is d. infant mortality. Most developing countries have high infant mortality which child rearing increase for about 3% in a day..
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