The largest time unit in the geologic time scale is the
A. period.
B. eon.
C. era.
D. epoch.

Eon: the longest division of geological time. Era:a major division of geological timePeriod:the interval taken to complete one cycle of a regularly repeating phenomenon. Epoch:a unit of geological time that is a subdivision of a periodThat means Eon is the largest time unit in the geological timescale

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