Which of the Following Is Considered a Problem with Mass

Which of the following is considered a problem with mass surveys?

A) Random sampling produces sampling error in surveys.
B) Results are often inadvertently influenced by how questions are worded in the survey.
C) A typical mass survey of 1,000 people is simply not large enough to draw scientific conclusions about national public opinion.
D) Random digit dialing only reaches people with telephones, which biases the sample by over-representing the wealthy.
E) Organizations that conduct polls almost always skew their results to favor the candidate or party that they support.