Which of the Following Is a Reason for the Discrepancy

Which of the following is a reason for the discrepancy between the UCR and the NCVS in the amount of forcible rape uncovered?

A) the dark figure of crime
B) the UCR is an official statement issued by the FBI whereas the NCVS is considered to be nonofficial
C) the UCR does not track local rape statistics
D) actually, there is very little difference between the two data sources
E) the proliferation of rape crisis counseling centers