Exclamation marks are used after interjections, or after sentences that express a strong emotion such as surprise, astonishment, etc. It may be used to end any exclamatory sentence to show emphasis. Additionally, it is used at the end of sounds that are produced mimetically, such as 'Grr', etc. In the sentence given, 'Woof' is a mimetically produced sound. Hence, the correct option is D) No Change.