Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'epoch'?

A. Eons are divided into eras [several hundred million years] [Wikipedia]
B. Periods are divided into epochs [tens of millions of years] [Wikipedia]
C. Eras are divided into periods. [Wikipedia]
D. Supereons are divided into eons. [billions of years] [Wikipedia]

Answer: Periods are divided into epochs [tens of millions of years] [Wikipedia]