Which sentence contains a misplaced modifier? The chicken soup that Mom made last night was the best. It was a tree branch hitting against the window that made my sister scream. The train whistle that sounded at the crossing made me jump. It was the frog that caught my eye on the lily pad in the pond.

Answer: The sentence that contains a misplaced modifier is the last one: It was the frog that caught my eye on the lily pad in the pond.

Explanation: A misplaced modifier is a grammar mistake that consists in improperly separating a word, phrase or clause from the word or phrase that it is modifying. In the sentence "It was the frog that caught my eye on the lily pad in the pond", "on the lily pad in the pond" is modifying "the frog"; however, "on the lily pad in the pond" has been placed at the end instead of being placed after "the frog". In that way, "on the lily pad in the pond" has been improperly separated from the phrase that it is modifying.