logos is using logic so it could be that, and ethos is using a character or tries to convince you of its credibility so that is another option. Decide if their trying to appeal to credibility or if the statistic is more important.
Hello :)
It would be 3, explaining how hunting is bad for the blue whales.
The first paragraph is showing how drastically their numbers have dropped from being hunted and the second paragraph is showing how more whales have been being sighted recently because of the decrease in hunting. Hopefully the population grows stronger soon.
Have a nice day!