Hello.
A misplaced modifier is a phrase or clause that's just thrown into the sentence, and as a result, it makes the sentence pretty strange.
The answer choice "C.) The granola bar had a shiny wrapper that she ate" contains the misplaced modifier "that she ate"; it should be "The granola bar that she ate had a shiny wrapper," but it is placed at the end of the sentence instead of the middle.
I hope this helps!