The correct answer is: B. QSPR
The first sentence (S1) introduces the topic of the passage, which is how to get people to do things the way you want. The second sentence (P) provides a reason why the first sentence is true: it is difficult to make people do things against their will. The third sentence (Q) provides a solution to the problem: arouse a want in people and they will do things willingly. The fourth sentence (R) provides evidence to support the third sentence: even young children resent being made to do things. The fifth sentence (S) summarizes the main point of the passage: the secret of motivation is to arouse the right kind of want in people.
The other options are incorrect because they do not follow the logical order of the sentences. Option A (PRQS) puts the second sentence before the first sentence, which makes it difficult to understand why the second sentence is true. Option C (RPSQ) puts the third sentence before the second sentence, which makes it difficult to understand why the third sentence is a solution to the problem. Option D (SRQP) puts the fifth sentence before the first sentence, which makes it difficult to understand what the main point of the passage is.