The Clever blonde in school

Next day the blonde came…
home and went to her mother and said, “Today in school we learned our ABCs! The other kids could only get to D but I can get to K! …. A, B, C, D, E, F, G, H, I, J, K!”
The mother says, “Very good honey.” The blonde then asked. “Is that because I’m a blonde, Mommy?” The mother responds, “Yes dear.”
The third day the blonde come home from school and said to her mother, “Mommy today in school we went swimming! But I was the only one who had breasts.
Is that because I’m a blonde, Mommy?” And the mother responds, “No Honey, it’s because you’re twenty five.”