Out of the options you provided, the most effective way for Holly to persuade her audience that animals have always had certain rights in Western culture would be to use option 2: show pictures of adorable animals while describing the history of the animal rights movement.
This approach is effective because it combines visual aids with a persuasive narrative that describes the historical background and evolution of animal rights in Western culture. By using pictures of adorable animals, Holly can engage her audience emotionally and create a connection with them. This can help her audience to better understand the importance of animal rights and the need to protect them.
Option 1 might be too graphic and could turn off the audience. Option 3 might not be relevant to the topic, and option 4 might be perceived as manipulative and not persuasive. Therefore, option 2 is the best choice for Holly to make her case.