To make the second paragraph flow smoothly, it'll make sense to have the transition phrase: <u>After the park</u> since the first paragraph talks about the dogs, Sage and Stella, having fun at the dog park. Answer choice D, especially, doesn't make sense since the last sentence in the first paragraph says "...but the day wasn't over yet!"
Answer: If you want you can make the poem rhyme. I personally find it easier to do so. Also, what type of poem is it? Is it a haiku? I can give you more tips if I know what type of poem.