Which of the Following Laws Was Held Not to Be

Which of the following laws was held not to be in violation of the dormant commerce clause for unfairly discriminating against out-of-state interests?

A) a law that imposed a surcharge of $2.50 on solid waste if the waste had been generated out of state, but only $.85 if generated within the state
B) a property tax exemption for charitable institutions that excluded organizations operated principally for the benefit of nonresidents
C) a state law that "tolled" the statute of limitations for a breach of contract case for times that the defendant was out of state
D) an environmental law prohibiting milk from being packaged in plastic containers when the result was a benefit to the large paper industry of the state