GMAT Sentence Correction (SC) | Re: According to scientists who monitored its path, an expanding cloud

According to scientists who monitored its path,an expanding cloud of energized particles ejected from the Sun recently triggered a large storm in the magnetic field that surrounds Earth. which brightened the Northern Lights and also possibly knocking out a communications satellite.

(A) an expanding cloud of energized particles ejected from the Sun recently triggered a large storm in the magnetic field that surrounds Earth,which brightened the Northern Lightsand also possiblyknocking

(B) an
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