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 logical sequence of the sentence in the passage.

S1. Much of our adult behavior and our attitudes are determined by our upbringing.

P: But the process does not stop here.

Q: In particular by the effects of that small part society which is our family.

R: As we grow we are constantly and increasingly affected by new forces such as the social pressure of our friends and the larger world of society.

S: The family and our early life have profound effect on our later life.

S6. Psychologists have studied these forces in depth.