The following sentence has a dangling modifier. After reading the book it was based on, several key plot elements were missing from the movie. Which revision best corrects the error in this sentence? Several key elements were missing from the movie, I noticed, after I read the book it was based on. I noticed that several key plot elements were missing from the movie after I read the book it was based on. After reading the book that the movie was based on, I noticed that the movie was missing several key plot elements. I noticed, after I read the book it was based on, that several key plot elements were missing from the movie.

C) After reading the book that the movie was based on, I noticed that the movie was missing several key plot elements.

The correct answer is:

After reading the book that the movie was based on, I noticed that the movie was missing several key plot elements.

A dangling modifier is a word or phrase that doesn't connect correctly to the rest of the sentence. Modifiers should be placed as closely as possible to the subject, verb or objective they are modifying.

In the example:

After reading the book it was based on, several key plot elements were missing from the movie.

The problem in this sentence is that we do not know who read the book, or what was based on the book. To correct this a subject must be added so the modifier has something to describe.

Correction:

After reading the book that the movie was based on, I noticed that the movie was missing several key plot elements.

Now we know who read the book, and that the movie was based on the book so the modifier is no longer dangling.