In the following items, each passage consists of six sentences. The first and the sixth sentence are given in the beginning as S1 and 56. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark your response accordingly on the Answer Sheet.
S1: Don't you think that the housefly is a nuisance ?
S6: When you see a fly rubbing its legs together, it is just cleaning itself, and scraping off some of the material that has gathered there.
P: For ages that's what man considered the fly to be — just a nuisance.
Q : It was discovered that these flies carried disease germs that cause the death of millions of people every year.
R: But now we know that the innocent-looking housefly is one of man's worst enemies.
S: It makes an irritating buzzing sound, it annoys you when it crawls on your skin, and so on.
The proper sequence should be

Options

A. R Q P S
B. P Q S R
C. Q P R S
D. S P R Q