Which sentence uses the word era correctly? she was the best speller in her class that era. before the era was over, the mice had eaten the cheese. he is the most famous poet of the modern era. in what era did you learn to read?

The correct answer is C. He is the most famous poet of the modern era.

Explanation:

In English language, the word "era" refers to a major period of time, because of this eras are used in geology to describe long periods of time such as the Paleozoic or the Mesozoic era or in history to describe the main divisions in human history based on certain events this includes three main periods that are the Ancient Period, the Middle Ages and the Modern Era that cover multiple centuries and other smaller eras such as the Age of  Discovery or the Civil War Era that cover shorter periods of time. Considering this, the sentence that uses the word era correctly is "He is the most famous poet of the modern era", because in this sentence the word "era" is used to describe a main period of time in history which is the "Modern Era" rather than a short period of time and therefore, the use of the word fits with is meaning which makes this sentence correct.

idk tbh because i'm just getting points.