As of 2012, how many near-Earth asteroids, with sizes over 1km, had been discovered by the Spaceguard survey?   a Only a few dozen b Nearly 1000 c Nearly 50,000 d About 500

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As of 2012, how many near-Earth asteroids, with sizes over 1km, had been discovered by the Spaceguard survey?
 
a Only a few dozen
b Nearly 1000
c Nearly 50,000
d About 500
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