C) The width of the rubber bladder should equal to 40 percent of the arm circumference.
so option C is correct answer of this question.
According to American Heart Association Recommendations (AHA) for Physical Activity in Adults and Kids.
The ideal length and width of a bladder are given below:-
1.The length of the ideal bladder is greater than or equal to 80 percent of the circumference of the arm of the patient .
2.The width of the ideal bladder is greater than or equal to 40 percent of the circumference of the arm of the patient .
Here we are assuming arm as a cylinder having some radius r . so the arm must have some circumference .
so in the given conditon constraint on width satisfies the given conditon which is the case of 40% of the arm circumference.
and hence according to AHA guidelines only option C is correct.
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