A contractor orally agrees to build a custom-designed home for a client for a price of $600,000. The construction is expected to take 18 months to complete. After six months of work, the client disputes the payment terms and attempts to cancel the project. Which legal principle is most likely to make this oral agreement unenforceable?
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A
The parol evidence rule
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B
The doctrine of promissory estoppel
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C
The Statute of Frauds
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D
The rule of mutual assent