Direction: In the following question, a passage consists of six sentences. The first and the sixth sentences are given in the beginning as S1 and S6. The middle four sentences have been removed and jumbled up. These are labelled as P, Q, R, and S. You are required to find out the proper sequence for the four sentences and mark the correct option accordingly.

S1: Much of the blood on the street flows essentially from uncivil behavior of drivers.

S6: Due to these measures, the accident rate has decreased.

P: In addition, speed limits have been lowered.

Q: Who refuse to respect the legal and moral rights of others.

R: So the massacre on the road may be regarded as a social problem.

S: Safety standards for vehicle have been raised both at the point of manufacture and through periodic road-worthiness inspections.

The proper sequence should be