Use the Following Information for Questions

Use the following information for questions:
The result of an Internet poll was reported as evidence that most people believe the pledge of allegiance is constitutional. The poll was conducted by posting a notice on a website and asking people to respond. The results were based on 235 people who responded. Of the 235 people, 172 (73%) believed that the pledge is constitutional, while 63 (27%) believed that the pledge is unconstitutional.
-The results of this poll

A) are convincing, because 73% is an overwhelming majority.
B) are unreliable, because the sample size was too small.
C) are reliable, because the sample size was large enough.
D) cannot be generalized, because the results are based on a self-selected sample.