Which of the Following Is a Problem with Mass Surveys

Which of the following is 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 overrepresenting the young.
E) Organizations that conduct polls do not have enough funding to do the surveys properly.