Concept:This is a sentence ordering question testing logical flow in a passage about American idealism.
Explanation:S1 introduces American idealism as a belief in progress.
The next sentence should logically follow: R states the American view of history as a record of achievement.
Then P explains the consequence: because of human effort, the future will be better.
Next, Q introduces a contrast: Americans are optimistic but not wholly unrealistic.
Finally, S concludes with their common-sense practicality, leading to S6 about inheriting this sense from the English.
The correct order is R, P, Q, S.
Answer:Option C: R P Q S