which of the following assesses the research quality of university departments on the scale of 1 to 5

A．earthquakes may take place in anywhere possible
B．earthquakes may happen at any unexpected moment
C．most earthquakes take place simultaneously and unexpectedly.
D．the occurrence of earthquakes involves too many unforeseen factors .

A．A man that may come before the happening of an earthquake.
B．The leading factor that may cause a series of events to occur.
C．Any meaningful sign that indicates some would- be happenings.
D．An event that may have symbolic or significant nature.