In the Last Two Hundred Years, Seismic Activity in the San

Multiple Choice

In the last two hundred years, seismic activity in the San Francisco area has produced ____.

A) major earthquakes at intervals of about 60 years, with few smaller earthquakes
B) moderate (magnitude 6+) earthquakes every 10 to 15 years
C) moderate earthquakes every 10 to 15 years, and one major earthquake about 100 years ago
D) a cluster of moderate and major earthquakes in the early 1900s with a gap until recent moderate earthquakes
E) only major earthquakes