A doctor's office mails a survey to each of its patients. The results of the survey are based off of the total number of patients. Which of the following could affect the outcome of their surveys? A.The results could be flawed because the sample population was too large. B.The results could be flawed due to a wide range of topics in the questions. C.The survey is biased because they are only asking patients. D.The results could be flawed due to non-response of patients.