Number 5 should be the answer
It would be to distinguish fact from opinion. Think about it, when hearing the news and media don't you want to hear true facts about what is happening, or would you rather listen to someone's opinion; Especially when it might be different from your own beliefs and opinions.
The right answer is d. flatest and the proper spelling rule is to double the consonant when addix a suffix. The same happens in nouns/ adjectives like hot > hotter, jam > jamming.