Her Pediatrician Has Just Told Sandra That Her Four-Year-Old Son

Her pediatrician has just told Sandra that her four-year-old son, Manuel, has gained six pounds in the last year. Sandra should:

A) be alarmed, because this is too much weight gain.
B) be concerned, because this is too little weight gain.
C) be positive and change Manuel's diet.
D) be content that this is normal for Manuel's age.