How Can Studying the Geologic History of a Volcano Help

How can studying the geologic history of a volcano help most in eruption forecasting?

A) Most volcanoes erupt with a regular periodicity, so knowing the time period between eruptive cycles allows accurate predictions of when the next eruption will occur.
B) Information from geologic records allows scientists to pinpoint how big the next eruption will be from a certain volcano.
C) Mapping previous volcanic deposits from a volcano is helpful for developing hazard maps for use in land-use planning and disaster preparedness.
D) Mapping pyroclastic flows from previous eruptions will show exactly where the pyroclastic flows will go in the next eruption.
E) Mapping the extent of lahars from previous eruptions will show exactly where the lahars will go in the next eruption.