Answer:
B). Fast-food is unhealthy.
Step-by-step explanation:
An outline is elucidated as a strategy or map that intends to lay out the structure of the essay or work by categorizing the key points as well as sub-points that helps in presenting them in a more organized and coherent manner.
As per the question, the main point 'fast-food is unhealthy' could be best supported as the outline by the given example as it is not only the most logical one but also the most appropriate to be included as the key point that could be divided into sub-points which the author can explain further in a systematic and coherent manner. This outline would provide a structural pattern to his work. Therefore, option B is the correct answer.