According to the Section in Your Text About Political Polling,a

According to the section in your text about political polling,a big drawback of administering surveys over the phone is

A) Phones lines are unreliable.
B) You cannot manipulate the independent variable.
C) You cannot calculate the correlation coefficient.
D) The internal validity is low.
E) The sample might not be representative of the whole population because some kinds of people are more likely to have access to phones than others.