When you do physical exercise, the energy stored in the carbohydrate, fat, and other molecules in the cells of your body is converted to energy of motion.
a.
solar
b.
chemical
c.
heat
d.
wind

Answer is B. Chemical energy

Explanation: The chemical energy stored in the molecules in the cells of your body is converted to mechanical energy, the energy of motion, when you do physical exercise. This means that when you exercise these chemicals, carbohydrates and fats for example, are reacting and/or changing form.

Hope this helps

the answers would be

the first one and the second one

it is the most commonly accepted one