D is the error, there’s a grammatical error.
Answer:
<u><em>C. The antagonist Grendel is introduced very quickly.</em></u>
Explanation:
The use of <em><u>in media res</u></em> opens amidst a <u>prominent conflict</u> without the use of exposition, which <u>reinforces</u> and expects the readers' quick immersion to the story.
Through the <u>early introduction of Grende</u>l, the readers understand the <u>dangerous</u> and ominous force he is and represents for the rest of the characters in the poem.
WHAT type of reaction did he have? Cant answer without details!