b. they are repetitious lines
Both the lines "Rage, rage against the dying of the light" and "Rode the six hundred" both repeat in their poems. However, neither of them repeat at the end of every stanza. "Rage, rage against the dying of the light" trades with "Do not go gentle into that good night" for the last line of each stanza. "Rode the six hundred" is the last line of the first three stanzas. "Rage, rage against the dying of the light" does not end a sestet. The lines also do not begin an octave.
The correct answer is "pronoun", if the parentheses means that the italicized part is "He".
He is a third person singular pronoun denoting a male.
I believe subtext would be the best option, simply becasue the plot is more of the main idea and what is going to happen where the subtext is kind of what the author wants you to get out of it.
Sibilings is correct. Siblin is wrong.