I'll give you a question, please answer with step-by-step reasoning process.
Why does a bodybuilder eat so much?\nOptions:\n- pleasant conversation\n- store food for winter\n- satisfy hunger\n- sounds of digestion\n- gain weight

gain weight
Body builder needs to gain muscle in bulking phase.

Gainig muscle requires to eat more calories and result in gaining weight.

.

The answer: gain weight