What is the meaning of the word sublimest in the clause "Duty...is the sublimest word in our language" from "Letter to His Son"? most awe-inspiring

most ridiculous

simplest

funniest

The knights of the round table were bound by the code of chivalry that called for loyalty to king, god, and lady.  in which set of lines from  sir gawain and the green knight  does sir gawain describe upholding this code?