Sarah Is Informed That Both of Her 1-Year-Old Twin Daughters

Multiple Choice

Sarah is informed that both of her 1-year-old twin daughters are of "normal" weight. She is then informed that one weighs 7.3 kilograms (16 pounds) and the other weighs 11.8 kilograms (26 pounds) . How is this possible?

A) One of the twins likely has Down syndrome.
B) The daughters were likely weighed incorrectly.
C) The "normal" weight range for a 1-year-old is very wide.
D) The initial "normal" information was incorrect.