【单选题】By saying 'It's not the sort of thing you can catch by putting your child's arm in a cuff at the free monitoring station in your local grocery ', the writer implies
A.
hypertension is hard to detect
B.
children often refuse to have their blood pressure tested
C.
you'll have to pay a lot of money if you want to have your child's blood pressure checked in a grocery
D.
in a local grocery, you are free to determine how to have your child's blood pressure examined