Which of the following sentences demonstrates an error in parallel structure?
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A
The committee is responsible for drafting the proposal, reviewing the budget, and submitting the final report.
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B
To succeed in this role, you must be a strong communicator, a creative problem-solver, and work well under pressure.
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C
She spent the afternoon writing emails, returning phone calls, and organizing her files.
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D
The company's mission is to innovate relentlessly, to serve customers passionately, and to operate ethically.