GMAT Sentence Correction (SC) | Early mariners from the Vikings to medieval explorers were usually abl

Early mariners from the Vikings to medieval explorers were usually able to find their way if they employed early man-made navigation tools such as rudimentary magnetic compasses,geomagnetic lodestones, astrolabes, first used in classical antiquity, or the sun and stars .

A. geomagnetic lodestones, astrolabes, first used in classical antiquity, or the sun and stars.
B. geomagnetic lodestones, astrolabes, which were first used in classical antiquity, or the sun and stars.
C. geomagnetic lodestones,
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