If All Visitors to the CNN Web Site Are Invited

Multiple Choice

If all visitors to the CNN Web site are invited to take part in the daily poll online,is the resulting sample likely to be biased?

A) No,this will result in a simple random sample.
B) No,although this sample would not be random,it would definitely be representative of the population.
C) Yes,the sample is likely to suffer from non-response and self-selection bias.
D) More information is needed to answer the question.