Read the following sentences and arrange them in proper order –

Towards midnight
(P) so that the sky was lighted with
(Q) and the clouds drifted away
(R) the rain ceased
(S) the incredible lamp of stars

RQPS

The correct answer is option 4.RQPS.

Let us break down the arrangement "RQPS":

R: This begins the sentence by setting the time frame - "Towards midnight."

Q: Following "R," this segment describes the action taken by the rain - "the rain ceased."

P: Next, "P" details the subsequent action - "the clouds drifted away."

S: Finally, "S" concludes the sentence by describing the result of the actions - "so that the sky was lighted with the incredible lamp of stars."

So, when arranged as "RQPS," the sentence flows logically from setting the time frame to describing the cessation of rain, the movement of clouds, and the resulting illuminated sky.