Why might volcanologists want to monitor seismic activity around Mt. Rainier?
a. Earthquake swarms may indicate that Mt. Rainier's magma bodies are rising to the surface.
b. Seismic activity on Mt. Rainier is important to geologists who study earthquakes, but has nothing to do with a possible volcanic eruption.
c. Sensitive seismic sensors on Mt. Rainier can detect temperature changes that may accompany an imminent eruption.
d. An increase in seismic activity there could indicate an impending tsunami.