GMAT Sentence Correction (SC) | Re: Active underwater faults are observed carefully, tectono

Active underwater faults are observedcarefully, tectonophysicists monitor the physical processes that underlie tectonic formation to predict the movements of the Earth’s crust.

A. carefully, tectonophysicists monitor the physical processes that underlie tectonic formation to predict the movements of the Earth’scrust
Two ICS, joined by comma
B. carefully,whereas tectonophysicists monitor the physical processes that underlie tectonic formation to predict the Earth’s crust’smovements
Unneeded contrast