Final answer:
option A. In the poem, the couplet form completes the speaker's thought and emphasizes spiritual aspiration, where human beings aspire to become living temples of God, contributing to a sense of completeness.
Step-by-step explanation:
The couplet form in the poem supports the meaning of the lines "So may our breasts with ev'ry virtue glow, The living temples of our God below!" by completing the speaker's thought. A couplet is a pair of lines of verse that form a unit. In this instance, the couplet brings closure to the idea of human beings aspiring to embody virtues, suggesting that they can become living temples of God. It emphasizes a sense of wholesomeness and completeness by providing a rhythmical and thematic closure to the sentiment expressed, underlining the spiritual aspiration of the speaker concisely and harmoniously.