Turners syndrome is

The correct option is D All the above
A. Turner syndrome has a monosomy disorder. Monosomy means that a person is missing one chromosome in the pair. Instead of 46 chromosomes, the person has only 45 chromosomes.
B. Women with Turner syndrome are at extremely high risk for primary ovarian insufficiency (POI) and infertility.
C. Barr bodies are commonly referred to as sex chromatin. The human abnormalities called Klinefelter's syndrome and Turner's syndrome both result from an unnatural presence or absence of a Barr body.
So, the correct answer is "All the above".