GMAT Sentence Correction (SC) | Re: Seismologists studying the earthquake that struck northern

Seismologists studying the earthquake that struck northern California in October 1989 are still investigating some of its mysteries: the unexpected power of the seismic waves,the upward thrust that threw one man straight into the air, and the strange electromagnetic signals detected hours before the temblor .
(A) the upward thrust that threw one man straight into the air, and the strange electromagnetic signals detected hours before the temblor - Correct
(B) the upward thrust that threw one man
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