The answer is B. A does not make sense because Jessica should encourage her friend not discourage her. C is also incorrect because when you often scold at someone about something they will probably do the exact opposite of what your telling them to do.
Answer:
A well-balanced diet provides all of the: energy you need to keep active throughout the day. nutrients you need for growth and repair, helping you to stay strong and healthy and help to prevent diet-related illness, such as some cancers.