<span>The answer would be the first choice : It is respectful in tone to the audience and supports its claim with specific, credible evidence</span>
> The National Geographic magazine is recent, so it probably wouldn't have the best information on early efforts to stop poaching.
> The YouTube video is from an unknown source and unknown time, so its credibility is questionable.
> An editorial is opinionated, so there aren't many concrete, reliable facts.
The book is likely the most credible source because it isn't recent and the author has direct experience with elephants and efforts to stop elephant poaching.
The word colonists shouldn't be capitalized unless it's the starting of the sentence or if its used a a pronoun.
