Read the following sentence and choose the option that best maintains grammatical correctness and stylistic precision:
"The committee's decision to postpone the merger, which had been negotiated over eighteen months and involved three separate regulatory bodies, ______ the shareholders, who feared prolonged uncertainty."
Which choice correctly completes the sentence?
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A
alarmed
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B
was alarming to
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C
had the effect of alarming
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D
served to alarm