The story he told the police from the one he told his motherAspecialized inBexchangeCdifferedDexport选什么为什么选它

C. differed.

The word "differed" means that there was a difference or variation between the two stories. In this case, the story told to the police was different from the one told to the mother. The other options, "specialized in," "exchange," and "export," do not fit the context of the sentence.