The setting of the Sun is being described in the couplet as aforementioned by Wheatley.
A couplet is a piece of literary composition in which there are two lines. The lines in a couplet are either rhyming in nature or are of the same length.
In the couplet given above, Wheatley has described the situation where the sun is setting. It also described the conditions of the west that is deep red due to the setting of the sun.
Hence, option B holds true regarding the couplet by Wheatley.
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