A、  B、  C、  C(A)项contact为contract的近音干扰项；(B)指的是“已经签订合同”，与题干不符，故排除。

Is check ok?
(A) Yes, the condition of this machine is very good.
(B) Yes, we should check if everything is Ok.
(C) Yes, you can use it.

Are we anywhere near a contract yet?
(A) We keep contact with Mr. Smith.
(B) We have signed a new contract with a big company.
(C) I think we should further discuss some details of the contract.