If you write one sentence describing the original paragraph's hook, and then a second sentence describing any supporting evidence in the paragraph, and then a third sentence describing the topic sentence, you will have written your critique.
When people spend their money on fast food they are purchasing food that is unhealty normally. Homemade food or things you make at home, soups, casseroles and salads, baked chicken, will last for a week or two or longer if frozen for a future date. The fast food is expensive, not refillable, and after you eat it, many times you are still hungry. You have made no investment in putting food in the house for future meals for your family. Therefore, more money will be spent to make meals or to purchase moore fast food.
D is the sentence where it is used as an interjection. All the other answers use it as a pronoun.
Hope this helps!