Since <em>contrast</em> in short means to compare,
A. would be the best answer, since it compares the qualities of a dog to a cat.
Hope I helped!
Yes u need to start with a topic or title accordingly to ur topic , you’ll need to start with ur thesis statement includes 3 point . Therefore, each point will create a paragraph and each paragraph has 6 to 8 sentences . Your last paragraph will be 5 to 8 sentences conclusion it’s included each point of ur thesis statement proves , and last sentence will be the thesis statement by its self .