Please answer the following question by reasoning step-by-step.
Dan loved playing chess but he just couldn't anymore. He had been debilitated by what?\nOptions:\n- boredom\n- humility\n- arthritis\n- frustration\n- headaches

headaches
Game of chess uses brain and when one has headache they cannot concentrate.

Headache can cause great pain and debilitate people into not playing chess.

.

Therefore, the answer is headaches