This is beowulf's final heroic feat before his death.

a. the protection of hrothgar's throne
b. the defeat of grendel
c. the liberation of the stolen treasure
d. the defeat of grendel's mother

The best and most correct answer among the choices provided by your question is the first choice or letter A. 

Beowulf's final heroic feat before his death was that he protected Hrothgar's throne until his last breath.
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substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4

answer: x = 4 and y = 4

Ait serves as a prompt for the interpretive literary analysis