A consulting engineering firm submits a proposal to a client to design a new water treatment system for a fixed fee of $150,000. The client replies, "We accept your proposal, but you must also include soil testing services in the fee." What is the legal status of the client's reply?
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A
A binding contract has been formed, with the soil testing as a minor modification.
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B
The client's reply is a counter-offer, which terminates the firm's original offer.
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C
The firm's original offer remains open for acceptance for a reasonable time.
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D
An agreement in principle has been reached, which is not yet legally enforceable.