S1: You might say that all through history there have been wars and that mankind has survive inspite of them. P: Now, if his purposes are those of destruction, each fresh advance in his mastery of nature only increases the danger from war, as men learn to destroy one another in ever great numbers, from ever great distances, and in ever more varied and ingenious ways. Q: He has learned to tap the hidden forces of our planet and use them for his purpose. R: It has even developed and become civilised inspite of them. S: This is true, but unfortunately as part of his development man has enormously increased his power over nature. S6: Man has now discovered how to release the colossal forces locked up in the atom. The Proper sequence should be: A. PQSR B. PRQS C. QPRS D. RSQP

The correct answer is: A. PQSR

Here is a brief explanation of each option:

• Option A: PQSR
  This is the correct sequence. The first sentence (S1) introduces the topic of the passage, which is the danger of war in the modern world. The second sentence (S2) states that man has learned to tap the hidden forces of nature and use them for his purposes. The third sentence (S3) states that this has increased man’s power over nature, but unfortunately it has also increased the danger from war. The fourth sentence (S4) gives an example of this danger, by stating that man has now discovered how to release the colossal forces locked up in the atom. The fifth sentence (S5) concludes the passage by stating that man must use his power wisely, or he will destroy himself.

• Option B: PRQS
  This option is incorrect because it puts the second sentence (S2) before the first sentence (S1). This makes no sense, because the second sentence cannot make sense without the first sentence.

• Option C: QPRS
  This option is incorrect because it puts the third sentence (S3) before the second sentence (S2). This makes no sense, because the third sentence cannot make sense without the second sentence.

• Option D: RSQP
  This option is incorrect because it puts the fourth sentence (S4) before the third sentence (S3). This makes no sense, because the fourth sentence cannot make sense without the third sentence.