Early mariners from the Vikings to medieval explorers were

[BTGmoderatorDC]

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, and astrolabes, first used in classical antiquity, or if they could read the sun and stars.
D. geomagnetic lodestones, or astrolabes, first used in classical antiquity, or the reading of the sun and stars.
E. geomagnetic lodestones, astrolabes, which were first used in classical antiquity, and the sun and stars.

OA C

Source: Veritas Prep

[Neha sharma]

Imo- C
A. geomagnetic lodestones, astrolabes, first used in classical antiquity, or the sun and stars.

Incorrect-the sun and stars are not man made navigation tools

B. geomagnetic lodestones, astrolabes, which were first used in classical antiquity, or the sun and stars.
Sun and star is not man made

C. geomagnetic lodestones, and astrolabes, first used in classical antiquity, or if they could read the sun and stars.

Correct. 'if they could read the sun and stars' is parallel to 'if they employed early man-made navigation tools'

D. geomagnetic lodestones, or astrolabes, first used in classical antiquity, or the reading of the sun and stars.

Parallelism error, 'or the reading of the sun and stars'

E. geomagnetic lodestones, astrolabes, which were first used in classical antiquity, and the sun and stars.
Use of which is wrong and same as A