Final answer:
A positive energy balance is when intake of calories exceeds the energy expended, often due to decreased physical activity and increased caloric intake. This can ultimately lead to weight gain if not balanced out.
Step-by-step explanation:
A positive energy balance occurs when there is decreased physical activity and increased caloric intake (Option A). This is a situation where the amount of energy or calories you get from your diet is greater than the energy expended through your physical activity. When this state of positive energy balance is prolonged, it can result in weight gain (Option D). Being in a state of positive energy balance highlights the importance of maintaining an equilibrium between the calories consumed and the calories burned through physical activities to maintain a healthy weight.
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