A student is writing a paragraph about the decline of bee populations. The student wants to add a sentence that introduces a specific cause of this decline. Which of the following best fulfills this purpose?
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A
Bees are important pollinators that support agricultural systems worldwide.
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B
Researchers have identified pesticide exposure as a primary factor contributing to colony collapse disorder.
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C
Many farmers rely on bee pollination to produce fruits and vegetables.
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D
Bee populations have been declining for several decades across multiple continents.