The two things that Beowulf and the Odyssey have in common are the language in which they are told reflects the grandeur, nobility, and scope of the subject matter and they both follow the exploits of a single hero. The correct answers are D & B.
It's a nonessential word, clause, or sentence added to an already grammatically complete sentence. It's most commonly set off by brackets, but it can also be set off by commas or dashes.
Example:
My mother went to the supermarket and picked up some strawberries (my favorite fruit) earlier today.
Do it you self . use you brain and the knowledge god blessed you with