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<p>In an engineering test, a rocket sled is propelled into a target. If the sled's distance d in meters from the target is given by the formula d = 1.5t² + 120, where t is the number of seconds afer rocket ignition, then how many seconds have passed since rocket ignition when the sled is 10 meters from the target ?</p>

1. A 2.58
2. B 8.56
3. C 8.95
4. D 9.31