sat-dog

The correct answer is D. Choice D is the best answer because it creates a single sentence using a participial phrase to modify the subject. A participial phrase can be used to modify the noun or pronoun that comes before the phrase. It is separated by a comma from the rest of the sentence. Choice A is incorrect because it uses a comma splice, which is when two sentences are joined by only a comma. Choice B is incorrect because a colon is used to introduce an explanation or definition, not to combine two sentences. Choice C is incorrect because a semicolon is used to combine two closely related sentences, not to combine a sentence with a participial phrase.