Step 1: Understanding Geological Time Scale.
The geological time scale divides Earth's history into various time units, with "Era" being a major division of time. The Permian is an Era within the Paleozoic Era, not an eon, epoch, or period. Step 2: Analyzing the options. (A) Eon: Incorrect — Eons are the largest time division, far larger than eras. (B) Era: Correct — The Permian is an era within the geological time scale. (C) Epoch: Incorrect — An epoch is a smaller division than an era. (D) Period: Incorrect — A period is smaller than an era and typically refers to subdivisions within an era. Step 3: Conclusion.
The correct answer is (B) Era, as the Permian is an era in the geological time scale.