Final answer:
The pair of lines forming a couplet in the provided sonnet, typically found at the end and summarizing the theme, is option A: 'We must remember life is wonderful. / Enjoy it like the flowers basketful.'
Step-by-step explanation:
In the sonnet provided, a couplet is a pair of consecutive lines that rhyme and are of the same length. The pair of lines that form a couplet are often found at the end of a sonnet and typically summarize the theme or present a closing argument. Given the options to identify the couplet in the sonnet, the correct answer is:
A. We must remember life is wonderful. / Enjoy it like the flowers basketful.
This pair of lines not only rhymes but also concludes the sonnet with a thematic summary, which is characteristic of a couplet.