A contractor agreed to build a garage for $50,000. Halfway through, the contractor demanded an extra $10,000 or he would quit, and the homeowner agreed. Under the common law, is the homeowner's promise to pay the extra $10,000 enforceable?
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A
No, because the contractor had a pre-existing duty to complete the work
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B
Yes, because the parties modified the contract in good faith
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C
Yes, because contract modifications never require consideration
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D
No, unless the modification was in writing