If Only Some,but Not All,of Amanda's Somatic (Body)cells Had Only

Multiple Choice

If only some,but not all,of Amanda's somatic (body) cells had only one X chromosome,this could indicate that an error occurred ________.

A) during mitosis leading to the sperm or egg that came together to form Amanda
B) during meiosis in the first cell division of the original cell that was Amanda (the zygote)
C) during meiosis which occurred in Amanda's ovaries
D) during mitosis which occurred at a multicellular stage of Amanda's development