`S_(1)` : Several times in the history of the world, some countries and cities, have attained a high degree of civilization.
`S_(6)` : For the barbarians are always liable to break in on you and with their greater numbers and rude vigour, scatter your civilization to the winds.
P : One of the reasons why they did not last was that they were confined to a very few peple.
Q : Now it is no good being civilized if everbody around you is barbarous.
R : Yet none of these civilizations, important as they were, have lasted
S : They were like little oases of civilization in deserts of barbarism.
Which one of the following is the correct sequence ?
A. S-P-Q-R
B. R-P-S-Q
C. P-R-S-Q
D. R-P-Q-S
