They wouldn't do it if they understood just how unhappy they're making these animals. The passage primarily uses a pathos appeal. Hence, option D is correct.
Pathos, sometimes known as the appeal to authority, is a rhetorical device used to persuade readers by deliberately arousing particular feelings in them to produce the desired emotional response. Authors choose their words carefully, employ meaningful terminology, and employ instances and narratives that arouse feelings.
An example of the pathos appeal is A teenager tries to persuade his parents to buy him a new car by claiming that if they cared about their child's safety, they would upgrade him.
Thus, option D is correct.
For more details about pathos appeal, click here:
https://brainly.com/question/1392626
#SPJ5