Concept:Logical sequencing of sentences to form a coherent passage.
Explanation:S1 says: "We do not know what to do with our knowledge."
Sentence S follows naturally: "Science has given us superhuman powers, which we do not use properly."
Next, P provides an example: "For example, we are unable to manage our machines."
Then R explains the consequence: "Machines should be fed properly... otherwise they refuse to work or cause destruction."
Finally, Q states the difficulty: "We already find it difficult to do without machines."
This leads to S6: "In the course of time they may rule over us all together."
Thus the correct order is S, P, R, Q.
Answer:A. S P R Q