In the following question, there are six sentences marked S1, S6, P, Q, R, S. The positions of S1 and S6 are fixed. You are required to choose one of the four alternatives which would be the most logica passage.

S1. A certain young man was entrusted to the care of a teacher.

P: This dullard will come to grief if I send him away without a single lesson, thought the teacher.

Q: He was so dull of mind that he could not, even in three months, time, learn as much as a single lesson.

R: The young man came to ask the teacher's permission to go home.

S: It's my business to provide a good education to my pupils, to get on in life.

S6. The teacher asked him to wait.