Regarding Down Syndrome, Which of the Following Statements Is TRUE

Multiple Choice

Regarding Down syndrome, which of the following statements is TRUE?

A) Down syndrome is a sex-linked hereditary condition.
B) Down syndrome results from an inherited inability to control a destructive chemical that builds up in their bodies.
C) Down syndrome is a condition caused by an extra chromosome at pair 21.
D) Down syndrome is caused by the mother's heavy drinking during pregnancy.