The Mercalli Intensity Scale Tends to Be Very Subjective and Thus

The Mercalli intensity scale tends to be very subjective and thus is generally only used for historical earthquakes that were near people but were not recorded by seismometers. The Mercalli scale may be considered subjective because it

A) relies on testimony from people.
B) does not take distance into account.
C) can only be used for large earthquakes.
D) cannot be used in heavily populated areas.