A Couple Has Given Birth to Their First Child,a Boy

A couple has given birth to their first child,a boy with a recessive disorder.The genetic counselor tells them that the risk of recurrence is one in four.Which statement is a correct interpretation of this information?

A) The risk factor remains the same for each pregnancy.
B) The risk factor will change when they have a second child.
C) Because the parents have one affected child, the next three children should be unaffected.
D) Because the parents have one affected child, the next child is four times more likely to be affected.