S1: John Young, the astronaut, piloted the 75-ton space-shuttle, Columbia.

S2: And it moved smoothly to a stop as the crew rushed to greet it.

P: The Columbia, however, landed safely at the Edwards Air Force base in the Mojave desert.

Q: The space-shuttle circled the Earth 36 times.

R: It was dangerous because a reusable craft was being used now.

S: This flight was fraught with dangers.

The proper sequence should be?

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P-Q-S-R

S-Q-R-P

P-R-S-Q

Q-S-R-P

answer is D.

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Detailed Solution

●        The sentence that most closely relates to S1 should be the first one in the series. It must build upon or expand upon S1.
●        Q comes first in the list: S1 begins by stating that the 75-ton space shuttle Columbia was piloted by astronaut John Young. Q elaborates on this subject. The spacecraft reportedly made 36 orbits around the planet.
●        S comes after Q: S introduces a subtopic. It claims that there were many hazards on the flight.
●        S is followed by R, who refutes S' assertion. It claims that the usage of a reusable craft made it unsafe.
●        R is followed by P, who brings the previous topic to a close. However, it claims that the shuttle touched down at Edwards Air Force Base in the Mojave Desert without incident. This conclusion is continued in S2. The crew reportedly ran to meet the shuttle as it slowly came to a stop.
●        Thus, Q -S -R- P is the proper order. Option 4 is the right answer, thus.

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