The main two factors that control the metabolic rate are

Body size: Metabolic rate increases as weight, height, and surface area increase. Body composition: Fat tissue has a lower metabolic activity than muscle tissue. As lean muscle mass increases, metabolic rate increases. Gender: The basal metabolic rate (BMR) averages 5 to 10 percent lower in women than in men.

Answer d would be the best answer, for he wants to have part in biotechnology. an ekg technician is quite similar.