Answer :

Eon: the longest division of geological time. 
Era:a major division of geological time
Period:the interval taken to complete one cycle of a regularly repeating phenomenon. 
Epoch:a unit of geological time that is a subdivision of a period

That means Eon is the largest time unit in the geological timescale
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The largest time unit in the geologic time scale is the? The answer would be, B. Eon.

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