Read the following paragraph and identify the main idea:
The gradual decline of honeybee populations is a serious environmental concern with far-reaching consequences. These insects are vital pollinators for a vast number of crops, including fruits, vegetables, and nuts. Without effective pollination, agricultural yields could plummet, leading to food shortages and economic instability. Furthermore, the loss of honeybees disrupts natural ecosystems, as many wild plants also depend on them for reproduction. Factors contributing to this decline include pesticide use, habitat loss, and climate change, making it a complex problem that requires a multifaceted solution.
Which of the following statements best expresses the main idea of the passage?
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A
Pesticide use is the primary cause of the decline in honeybee populations.
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B
The decrease in honeybee populations poses a significant threat to agriculture and ecosystems.
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C
Honeybees are essential for pollinating fruits and vegetables.
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D
Climate change and habitat loss are complex environmental problems.