The two tasks that a geologist performs are:
Investigates the formation process of rocks.
Measures earthquakes and tsunamis using seismographs.
Thus, option "C and D" is true.
Who is Geologists?
Geologists study the earth and everything that is related to it, their work field covers from the research of how the earth was created and all its ages of it, to how it react and changes during time.
The other sentences are related to other professionals, such as architects, engineers, and perhaps sewers. There are only two activities related to the behaviour of earth on the list.
Thus, option "C and D" is true.
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