Informal means slang or figurative syntax and so on therefore the answer would be D
D. Pea soup, which is my friend’s favorite, is very easy to make.
The nonessential information is that pea soup is her friend's favorite. The fact that it is her friend's favorite does not relate to how easy it is to make. In the other options, the information is essential. For A, it tells when it is important to know the directions. In Option B it explains why the dog must eat at the same time. In Option C, it tells why Kim is upset.
It is important to fight and stand for what you believe in so people understand that you are ambitious and believe in this right.
