GMAT Sentence Correction (SC) | In an area devoid of volcanic activity

In an area devoid of volcanic activity, adiscovery has been made by a team of scientists from the University of California that a fragment of the Swiss Alps seems like it came from a depth as far down as 415 mies.`

A.discovery has been made by a team of scientists from the University cf California that a fragment of the Swiss Alps seems like it came from a depth as far down

B.discovery was made by a team of scientists from the University of California who found a fragment of the Swiss Alps