P: only five or six new ones
Q: to have been found, although
R: there are over 31,000 documented meteorites
S: are found every year
Answer: C
Correct answer: RQPS
The sentence reads:
There are over 31,000 documented meteorites to have been found, although only five or six new ones are found every year.
R is the main clause and Q completes it while opening the concession with although. P is the subject of that concessive clause and S its verb, so the two must follow in that order.
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