The sentence that contains a misplaced modifier is "The salesman sold the sports car to the young man with the leather seats".
A misplaced modifier is a word, phrase or clause that is occupying an improper place in the sentence because it has been separated from the word or phrase that it is modifying. Types of misplaced modifiers are misplaced adjectives, misplaced adverbs and misplaced phrases. In the sentence "The salesman sold the sports car to the young man with the leather seats", the misplaced modifier is "with the leather seats" since it is separated from the phrase that it is modifying ("the sports car").