I fell into one of those online list rabbit holes and wasted nearly an hour reading about surprising things that are coeval, like the first fax machine and pioneers heading west on the Oregon Trail. What does the word "coeval" mean in this context? Use these dictionary entries to answer the question:
co- (prefix) with, together
-ev (suffix) time period, era

A) equally important in history

B) took place one after the other

C) occurred long ago

D) happened at the same time