Suppose a friend of yours says she is a 75% free-throw shooter in basketball. You don’t think she is that good and want to test her to gather evidence that she makes less than 75% of her free throws in the long run. You have her shoot 30 free throws and she makes 18 (or 60%) of them. Are the validity conditions met for the one-proportion z-test? 

A. No, because the sample size is less than 40. 

B. No, because the number of success and failures are each at least 10. 

C. Yes, because the sample size is more than 20. 

D. Yes, because the number of success and failures are each at least 10