Your title depends on what your text and reasons are specifically about and what the information you are given is, however I would choose whichever one fits your information the best. However, they all are talking about bicycles. I would most likely choose the health benefits of bicycling.
I would say the first option. "river knows. I from man conceal". To me says nature knows but he's hiding it from people.
Answer:
Look below.
Explanation:
You didnt provide the second sentence but from my understanding the prefix "un" , which means not, could be added to friendly to mean unfriendly or not friendly.
Answer:
Facts, statistics, quotations, examples, hypotheticals.
Explanation:
In any work where one has to produce or make a claim, it is important to <em><u>support one's claim with sufficient facts, statistics and quotations, examples and even hypothetical assumptions</u></em>. If these factors are met, then it will be easier for the readers to understand and know the claims made by the writer as true.
For any form of argument, the proof of the claim is important. If these factors are available for the readers or the one judging the work, then it will also be easier to understand and even maybe accept the authenticity of the given work.