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I would say, it’s b, ‘what rewards will I get from using this source’
Catharsis is the cleansing of emotions by art.
So your answer would be B).
The primary subject of this poem is love, which is a powerful and binding force that can make two people into one. The other important theme is conjugal love, which in this poem is a perfect union between the speaker and her husband. The other two themes of death and religion are merged into love in this poem.