Which of the following sentences does NOT contain an adverbial clause？A．I will come with y

Which of the following sentences does NOT contain an adverbial clause？

A．I will come with you if you can drive me there.

B．I disagree with you in some points while I admit what you say.

C．It is our duty to serve the people.

D．The materials are good for use because the cost of core part is not high.

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