The correct option is E marriage vows
Option E, marriage vows, is the most appropriate answer. The poem refers to promises of love that the poet and the addressee may have for each other, or for other people in the past. They are aware of the efforts that go into fulfilling promises and the hardships that come with marriage. The statements of options A,B,C and D do not convey the same sentiments as that of the poem. Hence, they are wrong in this context.