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Here is a detailed explanation to this question-
Bunuel
Mercury lacks a substantial atmosphere unlike the other planets in the solar system, having such small size and proximity to the sun.
A. Mercury lacks a substantial atmosphere unlike the other planets in the solar system, having such
B. Unlike the other planets in the solar system, Mercury lacks a substantial atmosphere because of its
C. Unlike all the planets in the solar system, Mercury has no substantial atmosphere; because of its
D. Mercury lacks a substantial atmosphere unlike all the planets in the solar system: it has a
E. Unlike the other planets in the solar system, Mercury has no substantial atmosphere; because it has such
Meaning is crucial to solving this problem:Understanding the intended meaning is key to solving this question; the intended meaning of this sentence is that Mercury is unlike the other planets in the solar system, in that it lacks a substantial atmosphere because of its small size and proximity to the sun.
Concepts tested here: Meaning + Comparison + Grammatical Construction + Awkwardness/Redundancy• A comparison must always be made between similar things.
• Semicolons and the “comma + conjunction” construction are used to link two independent clauses; commas are used to link an independent clause with a dependent one; comma cannot be used to join two independent clauses.
A: This answer choice incorrectly compares the clause "Mercury lacks a substantial atmosphere" to the noun phrase "the other planets in the solar system"; please remember, a comparison must always be made between similar things.
B: Correct. This answer choice uses the phrases "the other planets in the solar system" and "because of its", conveying the intended meaning - that Mercury is unlike all planets in the solar system, other than itself, in that it lacks a substantial atmosphere because of its small size and proximity to the sun. Further, Option B correctly compares the noun phrase "the other planets in the solar system" with the noun "Mercury". Additionally, Option B avoids the grammatical construction error seen in Options C and E, as it uses the subordinating conjunction "because". Besides, Option B is free of any awkwardness or redundancy.
C: This answer choice alters the meaning of the sentence through the phrase "all the planets in the solar system"; the use of "all" illogically implies that Mercury is unlike all planets in the solar system, including itself; the intended meaning is that Mercury is unlike all planets in the solar system, apart from itself. Further, Option C incorrectly uses a semicolon to join the independent clause "Mercury has no substantial atmosphere" and "because of its small size and proximity to the sun"; please remember, semicolons and the “comma + conjunction” construction are used to link two independent clauses; commas are used to link an independent clause with a dependent one. Additionally, Option C uses the needlessly indirect phrase "has no substantial atmosphere", leading to awkwardness.
D: This answer choice alters the meaning of the sentence through the phrase "all the planets in the solar system"; the use of "all" illogically implies that Mercury is unlike all planets in the solar system, including itself; the intended meaning is that Mercury is unlike all planets in the solar system, apart from itself. Moreover, Option D further alters the meaning of the sentence through the clause "it has a small size and proximity to the sun"; the omission of "because" incorrectly implies that Mercury is unlike the other planets in the solar system, and
as a separate action it lacks a substantial atmosphere because of its small size and proximity to the sun; the intended meaning is that Mercury is unlike the other planets in the solar system,
in that it lacks a substantial atmosphere because of its small size and proximity to the sun. Additionally, Option D incorrectly compares the clause "Mercury lacks a substantial atmosphere" to the noun phrase "all the other planets in the solar system"; please remember, a comparison must always be made between similar things.
E: This answer choice incorrectly uses a semicolon to join the independent clause "Mercury has no substantial atmosphere" and "because it has such a small size and proximity to the sun"; please remember, semicolons and the “comma + conjunction” construction are used to link two independent clauses; commas are used to link an independent clause with a dependent one. Additionally, Option E uses the needlessly indirect phrase "has no substantial atmosphere" and the needlessly wordy phrase "because it has such", leading to awkwardness and redundancy.
Hence, B is the best answer choice.Additional Note: Please note the use of the semicolon in Option D; this usage is appropriate, as the clause that follows the semicolon provides an explanation for the clause that precedes it; in other words, it explains why Mercury lacks a substantial atmosphere.
To understand the concept of usage of punctuation on GMAT, you may want to watch the following video (~9 minutes):
All the best!
Experts' Global Team