Mercedes is conducting a study about the costs of prom dresses. Her school has 2500 students. She asks 10 of the girls in her AP statistics class to participate in a survey. She bases her findings on these results. Is this a valid study? Why or why not?
A) NO, she should ask the girls in her chorus class instead
B) YES, asking 10 girls in her class will give her a good sample to work with.
C) YES, drawing a sample only from AP statistics gives a random sample of girls attending prom at the school.
D) NO, drawing a sample only from AP statistics does not give a random sample of girls attending prom at the school.