Answer B: A man wearing a top hat and tuxedo ran after a dog.
The revision that corrects most effectively the mispladed modifier in the sentence is the one in the option B because the modifier 'wearing a top hat and tuxedo' is related to the the subject 'A man', and it needs to be right after the noun 'man'. Following the noun 'dog', the modifier infers that the dog is wearing a top and tuxedo.
