One of a Pair of Twins Is Diagnosed with ASD

One of a pair of twins is diagnosed with ASD.If this case follows research predictions,what is the probability that the other twin will also develop ASD?

A) The probability would be the same as with the twin's other siblings.
B) The probability would be highest if the twins were dizygotic.
C) The probability is lower than in the general public.
D) The probability would be highest if the twins were monozygotic.