Concept:Rearrangement of jumbled sentence parts to form a grammatically and logically correct sentence.
Explanation:The sentence begins with the subject "The knocking".
This is followed by S ("ceased") to describe the action.
Next, R ("although the echoes of it") introduces a contrast.
Then, P ("were still in the house") completes the contrast.
Finally, Q ("for some time") adds a time qualifier to conclude.
Thus, the correct order is S → R → P → Q.
Answer:SRPQ (Option A)