The correct answer is: A. PRQS
The idea of the Yahoos is one to be explored, but not taken as the last word about human nature. This is because the Yahoos are a fictional race of creatures that are described as being savage and uncivilized. While they may represent some of the worst aspects of human nature, they are not a complete representation of humanity. There are many other aspects of human nature that are worth exploring, such as our capacity for love, compassion, and creativity.
Option B, RQSP, is incorrect because it places the idea of the Yahoos last in the sentence. This makes it seem like the idea of the Yahoos is the most important thing to be explored, which is not the case.
Option C, SPRQ, is incorrect because it places the idea of the Yahoos in the middle of the sentence. This makes it seem like the idea of the Yahoos is just one of many things to be explored, which is not the case.
Option D, SRPQ, is incorrect because it places the idea of the Yahoos at the beginning of the sentence. This makes it seem like the idea of the Yahoos is the only thing to be explored, which is not the case.