Which one of the following is true with respect to cell phones?

a. Pollsters have been contacting people on their cell phones since cell phones were first introduced.
b. By 2007, more than 85 percent of American homes possessed only cell phones.
c. The existence of cell phones makes it easier to select a representative sample.
d. Cell phones are automatically disqualified from participation in scientific polls.
e. The first pollster did not contact people on cell phones until January 2008.

Answer: E