Which source of energy is ideal for prolonged, low-intensity activity? lipids protein glycogen lactic acid

The correct answer would be a lipid.

Fats or triglycerides are an ideal source of energy for low-intensity activity which exceeds 2 hours of duration as most of the glycogen reserves get depleted by that time.

In addition, the oxidation of fats or lipids generates more energy compared to the oxidation of carbohydrate or protein. For instance, 1 gram of fat produces 9 calories of energy as compared to the 4 calories produced by oxidation of 1 gram carbohydrates.

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