A teenager goes to the doctors office for his annual checkup. The doctor measures his height, weight and vital signs. Then she compares all the data with the previous year's results and says, "Congratulations on a successful year of mitosis!"

Which best explains the doctor's comment?

A. The teenager began to show signs of puberty
B. The teenager grew taller over the last year
C. The teenager recovered from a illness
D. The teenager lost weight over the year

I NEED QUICK RESPONSES PLEASE HELP!!!