An attorney agrees to represent a client on a contingency fee basis without putting the agreement in writing. Which statement best describes this arrangement under the Model Rules?
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A
The arrangement is per se unethical and the attorney must withdraw.
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B
The arrangement violates the Model Rules, which require contingency fee agreements to be in a signed writing.
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C
The arrangement is permissible as long as the fee is reasonable.
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D
The arrangement is only improper if the client later disputes the fee.