The word "watch" is unstressed in the last line of this stanza. Thus, the correct option is A.
In literature, a stanza may be defined as a section of a poem consisting of a sequence of lines positioned together in a usually systematic design of verse and rhyme.
The word watch is unstressed because it does not emphasize more ideas about woods that are kept and replenished with snow. The word snow, fill, and woods makes more sense in the last line of the stanza.
Therefore, the correct option for this question is A.
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