The correct option is 3). Sonnet XXXI best illustrates the division. In the octave, the poet observes that the moon is in love. In the sestet, he gives his reaction to the fickleness of woman's love.
The unifying theme of Sonnet 31 and Sonnet 39 is the "hopeless love". The two main things represented in the sonnets are the moon and sleep.
The moon stands alone in the sky so it has been represented as the solitary lover in the poem.
In the end, last lines are about the separation as poet stated that he is separated from his lover but they are really still one in the same.
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