SI : One of the first things the learning of a new language teaches you is that language comes from the region of the unconscious. S6: The test of how much you know is: how much can you say without having to think how you are going to say it ? P : What is often meant by “thinking in a language” is really the ability to use it without thinking about it. Q : We grown-up people have to filter it through our minds - a much more laborious process. R : That is why children learn a new language so effortlessly : it comes straight from their instincts. S : But we cannot say that we know a language, or know what we have studied of it, until we can use it instinctively. The proper sequence should be
- AS Q R P
- BR P S Q
- CP Q S R
- DR Q S P
Explanation
R explains children's effortless learning through instinct, developing S1's claim that language comes from the unconscious. Q contrasts grown-ups' laborious filtering, S states that knowing a language means using it instinctively, and P defines 'thinking in a language' as using it without thinking — a definition that caps the paragraph before S6's test. The order R Q S P (D) is the only coherent chain. Hence the answer is D.