Read the passage and answer the question.
Passage: Bees are essential pollinators for many of the world's food crops. Scientists estimate that approximately one-third of the food humans eat depends on pollination by bees and other insects. Bee populations have declined sharply in recent decades due to habitat loss, pesticide use, disease, and climate change. Researchers warn that without urgent action to protect bee populations, food security could be significantly threatened.
What is the central concern raised in the passage?
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A
Bees are being replaced by other insects as pollinators.
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B
The decline in bee populations poses a serious threat to food security.
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C
Pesticides should be banned from all agricultural use immediately.
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D
Humans eat too much food that depends on insect pollination.