Sari and Jon disagree over who needs more calories (proportionately) per day to survive: a three-month-old baby or a grown adult. Sari argues that a grown adult is bigger and needs more calories per pound of body weight. Jon believes the baby would require more calories per pound of body weight. Who is most likely correct and why?
A:Sari, because it takes more energy to move the larger muscles that adults have, so they need more calories

B:Jon, because babies grow at a much faster rate than adults and require more calories to support this growth

C:Joh, because babies are more active than grown adults and need more energy from calories

D:Sari because adults have more to do during the day and need more calories to sustain their activities