S1: The houses in the Indus Valley were built of baked bricks.
P: This staircase sometimes continued upwards on to the roof.
Q: Access to the upstairs rooms was by a narrow stone staircase at the back of the house.
R: The drains were incorporated in the walls.
S: The houses had bathrooms and water closets, rubbish chutes and excellent drainage systems.
S6: They led outside into covered sewers which ran down the side of the streets.
The Proper sequence should be:
A. PSQR
B. QPSR
C. QRPS
D. SPQR
Answer: Option B
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