A researcher wants to know how licensed drivers in the United States feel about establishing a law that requires individuals to take and pass another driving test at the age of 65 to determine whether they may retain their license. The researcher mails a survey to a random sample of 10,000 drivers out of all licensed drivers in the US. A total of 6,457 out of the 10,000 respond and 46% say they favor the test. Which of the following is true based on this information?

a. There is sufficient evidence that the percentage of all licensed drivers who say they favor the test is close to 46% because random sampling was used.

b. There is evidence of nonresponse bias in the survey results.

c. The results of this survey are invalid because the survey was mailed and not a face-to-face interview.

d. There is sufficient evidence that the percentage of all licensed drivers who say they favor the test is close to 46% because more than half of those who were mailed the survey responded.

e. There is strong evidence of convenience response bias in the survey results.