Which of the following sentences contain (s) a dangling modifier?

To raise a good dog, persistence is important.

Moving quickly, Annie chased the squirrels.

After eating the dog food, Annie belched.

All of the above

None of the above

A dangling modifier is usually a phrase that is improperly placed in a sentence, and thus creates confusion because it doesn't really modify any word.

Having this in mind, the sentence that contains a dangling modifier is the first one - To raise a good dog, persistence is important.

The phrase to raise a good dog is a dangling modifier here, because it is not placed in the right location in the sentence.