John, Age 4, Reports That When He Grows Up, He

John, age 4, reports that when he grows up, he will marry his mother. How should his family respond?

A) They shouldn't be too concerned because this is an example of the characteristic precausal reasoning of a young child.
B) They should be very concerned because John, by this age, should understand that this will not happen.
C) They should be very concerned because as it is a sign of a personality problem.
D) They shouldn't be too concerned because this is part of what happens as children begin the process of identification.