1 Answers
Option 2 : Q
The correct sentence is Q.
The first sentence must introduce a new concept without any prior reference and the best option for this is sentence S which introduces the discussion on diamonds. The second sentence is given and this extends the discussion by naming the interesting aspects of diamonds. The third sentence must either continue this description or introduce a related sub-topic and here, since there is one more sentence T which describes diamonds, we include that as the third sentence. Because the third sentence talks about diamond hardness, the fourth sentence can continue to elaborate on this and this is achieved in sentence P. Hence this is the fourth sentence. The fifth sentence is given and it introduces the importance of diamonds in history which is a new sub-topic. Sentence 6 must extend this sub-topic and this is done in Q where details about historic events and conquests are mentioned, hence Q is sentence 6. Sentence R is the last sentence because it includes the word 'also' which indicates that sentence 6 must have already introduced other historic events, which is the case.
So the correct order of sentences is S2TP5QR. Thus, option 2 is the correct answer.