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Question 56·Medium·Text Structure and Purpose

The following passage is adapted from a 2022 magazine article about honey-bee populations.

In the last two decades, beekeepers around the globe have watched their hives thin and falter, an unsettling trend now termed colony-collapse disorder. Scientists first documented the losses in commercial apiaries, where perfectly healthy bees seemed simply to vanish. Subsequent studies traced the disappearance to a web of stressors: pesticides that muddle bees’ navigation, mites that sap their strength, and shrinking fields of wildflowers that leave them underfed. Yet the news is not uniformly grim. Researchers have begun breeding mite-resistant queens, farmers are setting aside pollinator strips rich in clover and yarrow, and several nations have restricted the most harmful sprays. Together, these efforts hint that the long decline of the honey-bee may still be reversible.

Which choice best describes the structure of the passage?