One of my friends , whom I ' ve known for years , has a baby son . Recently he said the phrase " They grow up so fast ... " to me . I felt so old at the time .
Why is the narrator 's friend so proud ?
Pick the best answer from the following options:
A. They are very wealthy .
B. None of the above choices .
C. They are growing up fast .
D. They are very fast .


B