Which of the Following Best Describes Oil Shale Deposits

Multiple Choice

Which of the following best describes oil shale deposits?

A) organic-rich source rock that has never been buried deep enough to produce oil.
B) crude oil deposit in which the lighter molecules have migrated away.
C) shale that is saturated with crude oil, but requires fracturing to extract.
D) shale found at higher elevations in the Rocky Mountains.
E) the primary source of oil in the Western U.S. for the past 100 years.