The presence of three sex chromosomes in a persons cells is best explained by what cell process going wrong

I think it is C

Sorry if i'm wrong i have never seen this question before but i do know a lot about meiosis.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.