In humans, occasionally a baby is found that has the XY chromosomal karyotype but is phenotypically female. Which of the following statements might be a CORRECT explanation for at least some of these unusual cases?

A) A mutation has occurred in the SRY gene making it inactive.
B) An extra pierce of autosomal chromosome 15 is probably present in the genome but is too small to be detected.
C) A small piece of the X chromosome is missing but is too small to be detected.
D) The Xist gene on the X chromosome is mutated and inactive.
E) The ratio of number of X chromosomes to number of sets of chromosomes is incorrect.