Concept:Arranging jumbled sentences to form a coherent paragraph based on logical flow and cause-effect relationships.
Explanation:Sentence S1 introduces the driver blowing into a tube.
Q logically follows S1 because it describes what is inside the tube (crystals that change colour if alcohol is present).
S comes next, explaining that a colour change beyond a certain line indicates the driver is probably over the limit.
P follows S, stating that if the colour change does not reach the line, the driver cannot be punished under the new law.
R then provides the contrasting consequence: if the colour change does reach the line, the test is positive.
Finally, S6 says the driver will be asked to go to the police station, which fits after a positive result.
Thus the proper order is Q, S, P, R.
Answer:Option D (Q S P R)