A．By judging to what extent they can eliminate the risks.
B．By estimating the possible loss of lives and property.
C．By estimating the frequency of volcanic eruptions.
D．By judging the possible risks against the likely benefits.

A．He didn’t want to miss the game.
B．He would like to warm up for the game.
C．He didn’t want to be held up in traffic.
D．He wanted to catch as many game birds as possible.