Concept:The sentence order must follow the logical flow of the passage — from the choice of salt as a symbol to the specific actions and then the significance of the demands.
Explanation:After S1 (Gandhi sees salt as a symbol), sentence R explains why salt was chosen — it is essential and consumed by all.
Then P states what Gandhi did next: sending a letter to the Viceroy on 31 January 1930 with eleven demands.
Next, Q clarifies the purpose of those demands — to unite all classes in a common campaign.
Finally, S highlights the most stirring demand — abolishing the salt tax — which directly leads into S6 (the oppressive nature of the salt tax).
Answer:The correct sequence is RPQS.