Hrothgar asked Beowulf to battle Grendel's mother because the king believed he was the only man capable of dealing with such monsters. This was because Beowulf had earlier succeeded in mortally wounding Grendel. Further, Hrothgar wanted revenge for his close friend.
<span>It expresses more complete ideas.</span>
The Water is Wide is the true story of a young white schoolteacher -- a man who gave a year of his life to give an island and a people renewed hope. He becomes the teacher to their children, and teaches the adults of Yamacraw Island extraordinary lessons they didn't even know they needed to learn.
B, as there is no point in a comma there. There is already an and in the sentence which is a conjunction.
An absolute phrase modifies a noun, and it doesn't contain a verb. Having this in mind, the absolute phrase in this sentence is those living and dead.