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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.

way too easy for a 700 level question.

or the sun and stars - not man-made navigation tools.
A/B/E - out right away
in D - or the reading is not parallel with "employed".

C is the only one that stands!
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As pointed by everyone, the hint is in the question stem!!!! Sun and Stars are not man mad navigation tools. Hence, C IMO

Posted from GMAT ToolKit
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Hello experts, a prompt question that occurred to me while I was analyzing this sc problem are the following two examples of parallelism both accepted structurally?
1) x,y,and z
2) x,y,or z
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UNSTOPPABLE12
Hello experts, a prompt question that occurred to me while I was analyzing this sc problem are the following two examples of parallelism both accepted structurally?
1) x,y,and z
2) x,y,or z
Hello, UNSTOPPABLE12. To answer your question, yes, either variation is fine. Looking at the sentence at hand, we cannot tell whether early mariners made use of any or all of those man-made navigation tools at a given point in time. Perhaps some Viking or some medieval explorers used one, two, or all three of the implements in question during an expedition. We cannot lean on any contextual clues in the rest of the sentence to guide our thoughts.

- Andrew
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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.

-- 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 stars are not man-made navigation tools.

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

-- Looks good. Keep.

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

-- Parallelism not maintained. Should be 'if they could read the sun and stars.'

E. geomagnetic lodestones, astrolabes, which were first used in classical antiquity, and the sun and stars.

-- Sun and stars are not man-made navigation tools.

Answer is C.
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