Final answer:
Perry suggests that the thinking which divides the world into clear, opposing categories such as good and bad is known as Dualistic thinking.
Step-by-step explanation:
According to Perry, the type of thinking that assumes that the world can be easily divided into black and white, good vs. bad, or us vs. them is A) Dualistic thinking. Dualistic thinking suggests a clear distinction between opposing forces or elements, often simplifying complex situations into two categories. This is in contrast to relativistic thinking, which acknowledges that the meanings of concepts can change with time and place and that there can be many perspectives rather than an absolute truth.