<span>An eon is a geologically around tens of millions of years. A period is a million year included in an eon which is also made up of several eras. Therefore my answer is a period due to it being a subset of an era which is a subset of an eon.</span>
The answer is D because when I learned A couple of weeks ago before we started the American Revolution last week my social studies teacher said that indigo was a pigment for clothes for mercantilism.
