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Question 73·Medium·Text Structure and Purpose

Every ledger has two sides, and ours, at the botanical garden, was badly out of balance. Before we tally expenses, we must account for what cannot be counted. The month of June had yielded a terrace of bees, whose work stitched our lilies to the air. Volunteers had given Saturdays in handfuls, carrying compost that steamed like breath. No line item noted the child who learned to say "milkweed" and meant it.

Which choice best states the function of the underlined sentence in the overall structure of the text?