In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing many more prescriptions for higher-cost drugs.
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Aa phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing
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Ba phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing
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Ca phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written
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Dwhich occurred not just because drugs are becoming more expensive but doctors are also writing
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Ewhich occurred not just because of more expensive drugs but because doctors have also written
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正确答案: B