Which of the Following Statements Explains Why Restriction Enzymes Are

Which of the following statements explains why restriction enzymes are not useful for genome-wide studies of genetic variation?

A) There is simply too much DNA that has to be cut in order to get any information.
B) The differences in restriction sites are evened out when looking at the entire genome.
C) Using restriction enzymes will only tell us differences in sequence variation in restriction sites.
D) Restriction enzymes only recognize sequences found in genes.
E) None of the answer options is correct.