Dear Friends,
Here is a detailed explanation to this question-
SalahT
Usually busy transporting needed supplies to international sites,
as the demand for fuel has declined the huge supertankers filled with oil are currently floating offshore. A. as the demand for fuel has declined the huge supertankers filled with oil are currently floating offshore.
B. and floating offshore, the huge supertankers are filled with oil as the demand for fuel has declined.
C. huge supertankers filled with oil are currently floating offshore as the demand for fuel has declined.
D. huge supertankers, as the demand for fuel has declined, filled with oil are currently floating offshore.
E. the decline in the demand for fuel has left huge supertankers filled with oil currently floating offshore.
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 the huge supertankers filled with oil are usually busy transporting needed supplies to international sites but are currently floating offshore because the demand for fuel has declined.
Concepts tested here: Meaning + Modifiers + Grammatical Construction• Information that is important to the core meaning should not be placed within two commas.
• In a “phrase + comma + noun” construction, the phrase must correctly modify the noun; this is one of the most frequently tested concepts on GMAT sentence correction.
A: This answer choice incorrectly uses "Usually...international sites" to modify "as the demand for fuel has declined", leading to an incoherent meaning; the intended meaning is that the huge supertankers are filled with oil and are usually busy transporting needed supplies to international sites but are currently floating offshore because the demand for fuel has declined.
B: This answer choice alters the meaning of the sentence through the phrases "and floating offshore" and "filled with oil as the demand for fuel has declined"; the construction of these phrases incorrectly implies that the huge supertankers are usually busy transporting needed supplies to international sites
and usually floating offshore and are
filled with oil because the demand for fuel has declined; the intended meaning is that the huge supertankers are filled with oil and are usually busy transporting needed supplies to international sites but are currently
floating offshore because the demand for fuel has declined.
C: Correct. This answer choice correctly uses uses "Usually...international sites" to modify "huge supertankers", conveying the intended meaning - that the huge supertankers are usually busy transporting needed supplies to international sites. Moreover, Option C uses the phrase "floating offshore as the demand for fuel has declined", conveying the intended meaning - that the huge supertankers are currently floating offshore because the demand for fuel has declined. Further, Option C avoids the grammatical construction error seen in Option D, as it places no information between commas.
D: This answer choice incorrectly places information important to the core meaning of the sentence -- that the supertankers are floating offshore because the demand for fuel has declined, between two commas; please remember, information that is important to the core meaning should not be placed within two commas.
E: This answer choice incorrectly uses "Usually...international sites" to modify "the decline", illogically implying that the decline in demand for fuel is usually busy transporting needed supplies to international sites; the intended meaning is that the huge supertankers are usually busy transporting needed supplies to international sites; please remember, in a “phrase + comma + noun” construction, the phrase must correctly modify the noun.
Hence, C is the best answer choice.To understand the concept of "Phrase Comma Subject" and "Subject Comma Phrase" on GMAT, you may want to watch the following video (~1minute):
All the best!
Experts' Global Team