The answer you are looking for is the second one. Since the former king was highly liked for his reasonable decisions, you know that the new king must must be doing the opposite of the former king since he is disliked by many. Since he is doing the opposite, arbitrary must be the opposite of reasonable decisions, which makes it an antonym. Hope this helps! Comment if you have questions :)
the marine food chain are a diverse group that includes finned (sharks, tuna, dolphins), feathered (pelicans, penguins), and flippered (seals, walruses) animals.
