In Isabella's 8th grade class of 30 students, 24 students are 13 years old and 6 students are 14 years old. If a new student joins the class who is just 12 years old, what will happen to the mean and median of the ages of Isabella's class?
A. The mean will decrease and the median will decrease.
B. The mean will decrease and the median will stay the same.
C. The mean will stay the same and the median will decrease.
D. The mean will stay the same and the median will stay the same.
