D) is the most clearly stated claim. It states that eating a healthy breakfast has a positive result - improving a student's test score. Then, you can provide evidence on why later in the essay.
B, because in an article they tell you the facts about what happened. they don't use imagery to tell what happened .
Pride can be a good or bad thing. For example, having pride in yourself can help with confidence and self-esteem. On the other hand, having too much pride can lead to ignorance and irrational decisions. Think of some examples from literature to represent this two-sided trait. There are plenty of characters in novels who had just the right amount of bravery and assurance, and the same goes for self-obsessed antagonists, as well. If you have any more questions, feel free to contact me through the chat! I hope this helps :)