Correct Answer: Option B

Explanation

For endurance events like marathons, athletes need a steady and prolonged supply of energy to maintain performance
over long periods. Complex carbohydrates - found in whole grains, legumes, vegetables, and some fruits - are ideal
because they break down slowly during digestion, releasing glucose gradually into the bloodstream. This steady
glucose availability helps maintain stable blood sugar levels and provides sustained energy throughout the race.
While fats are also an important energy source, they are primarily utilized during low to moderate intensity activity
and do not provide quick energy needed for high endurance. Fats are also essential for muscle repair, but during the
marathon preparation phase, the focus is on maximizing glycogen stores (the stored form of carbohydrates in muscles
and liver) to delay fatigue.
Proteins mainly serve the function of repairing and building muscle tissues but are not a primary energy source during
long-distance running. Consuming excessive protein for energy is inefficient and can strain the digestive system.
Vitamins are vital for overall health and metabolic processes but do not directly provide energy or regulate body
temperature in the context of race preparation.
Therefore, a diet rich in complex carbohydrates is crucial for marathon runners to optimize endurance performance by
ensuring a reliable energy source.

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