Pick the word which best completes the sentence.

the worked to determine when the volcano would next erupt.

a. meteorologist
b. cumulonimbus
c. volcanologist
d. biologist

C. Volcanologist

Explanation:

A volcanologist is a geologist (expert in studies of land) who studies the processes involved during the formation and eruption of volcanoes. Hence it is volcanologist's work to study and determine/estimate when the volcano would erupt next.

A meteorologist is expert in studies of weather.

Cumulonimbus is a type of cloud in which a large quantity of water vapors is carried upward by air and form a dense, towering and vertical cloud.

A biologist is expert in biology who studies processes and knowledge related to living things.

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