Maria Gives Birth to a Child with Trisomy 21

Multiple Choice

Maria gives birth to a child with trisomy 21.Which of the following is true?

A) Maria must have given her child an extra 21st chromosome.
B) The child's father must have given the child an extra 21st chromosome.
C) The child received an extra 21st chromosome from either her mother or her father.
D) Both parents contributed an extra 21st chromosome.