The Problem with Using Nonprobability Samples Include That

Multiple Choice

The problem with using nonprobability samples include that

A) it's impossible to assess the degree of sampling error.
B) we can't say anything about what would have been true for the overall population.
C) we're stuck with sample statistics and don't know whether they apply to the population as a whole.
D) All of these are correct.
E) None of these are correct.