Concept:The correct sequence arranges sentences so that the argument flows logically from a general claim to specific examples and then to a conclusion.
Explanation:S1 introduces the failure to protect against epidemics.
R directly follows S1 by calling this a serious blot on education and linking doctors' failure to eradicate diseases.
P continues with the same idea, stating that doctors could have done better if medical training started earlier.
Q then shifts to a broader observation: homes lack hygiene knowledge.
S ends the middle section by expressing doubt about graduates’ basic survival knowledge (snakebite).
S6 wraps up by labelling the system as disastrous.
The logical flow is: S1 → R → P → Q → S → S6.
This corresponds to the sequence R P Q S.
Answer:Option C (R P Q S)