Suppose That the Proportion of All American Adults That Fit

Suppose that the proportion of all American adults that fit the medical definition of being obese is 0.23. A large medical clinic would like to determine if the proportion of their patients that are obese is higher than that of all American adults. The clinic takes a simple random sample of 30 of their patients and finds that 9 patients in the sample are obese.
-The researchers created the following simulated null distribution with 1000 trials using the One Proportion applet:

What is the appropriate label for the x-axis of the randomization distribution plot?

A) Proportion of obese patients in a sample of 30 patients assuming the true proportion of obese patients is greater than 0.23
B) Proportion of obese patients in a sample of 30 patients assuming the true proportion of obese patients is equal to 0.23
C) Number of obese patients in a sample of 30 patients assuming the true proportion of obese patients is greater than 0.23
D) Number of obese patients in a sample of 30 patients assuming the true proportion of obese patients is equal to 0.23