Sometimes during a reaction contamination can be introduced into the sample. If this happens which of the following would be true about the mass of the sample if it were contaminated?

The measured mass of the product would be higher than what it really is. A.The sample would be unaffected by the contamination. B.The theoretical yield would be higher than it should be. C.The theoretical yield would be lower than it should be. D.The measured mass of the product would be lower than what it really is.