Formal language is also called "proper language" because it is the type of language you would use when first meeting someone or giving a speech at a high class place so the correct answer is:
<span>B) Have I convinced you that the study of grammar is important and well worth your effort? </span>
Answer: <u>An epic poem, one of the most important that marked Medieval Era at England</u>
Explanation: The autor is unknown, and they wrote in old-english. The poem tells the history of Beowulf, a powerful and strong hero that is called by the king to defeat a treat to the kingdom.