Correct option is B
The correct sentence is (b) "She got cold feet and decided not to go through with the wedding." The phrase "get cold feet" is an idiomatic expression that means to suddenly become too scared or nervous to do something that was previously planned or agreed upon. In this context, the bride-to-be became too nervous to go through with the wedding. The past tense of "get" is "got," so option (b) is the correct form of the sentence.