The answer is B. Compound sentence
It first became an issue in the U.S. after the Civil War. Many felt that the trademark value of the American flag was threatened on at least two fronts in the years immediately following the Civil War: once by the preference of white Southerners for the Confederate flag, and again by the tendency of businesses to use the American flag as a standard advertising logo. Hope, you will find it helpful. In case, it is different from what you need, check it at PrimeWritings. I absolutely love them.
Here are a few universal themes conveyed in this scene.
The battle of good and evil. Beowulf is a young warrior who wants to stop the terror of monsters. He is a paragon of good, just like Grendel's mother is a paragon of evil. She is an implacable force of evil, who tries to exterminate the hero who has dared challenge her.
Courage and self-sacrifice. Beowulf has many reasons to fear the furious monster who wants to avenge her son's death. Nevertheless, he enters the battle, fully aware that he is risking his life. His courage is one of his heroic traits, which separate him from other humans.
Magic and supernatural. First, there's the fact that Grendel's mother is living in a lake. Then, there's the ancient sword that seems to be the only way to kill this monster, even though it melts down after Beowulf has decapitated Grendel's corpse with it. Then, there's the fact that Beowulf somehow manages to survive under water, even though he is only a human.
