Test: GMAT Verbal

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

1.

Hydraulic fracturing causes earthquakes that are usually too small to be detected at the surface, although tremors attributed to fluid injection into disposal wells have been large enough to be felt by people on numerous occasions.

that are usually too small to be detected at the surface, and tremors attributed to fluid injection into disposal wells were large enough to be felt by people on numerous occasions

that are usually too small to be detected at the surface, although tremors attributed to fluid injection into disposal wells have been large enough to be felt by people on numerous occasions

that are usually too small to be detected at the surface, although tremors attributed to fluid injection into disposal wells are large enough to be felt by people on numerous occasions

that are usually too small to be detected at the surface, although tremors attributed to fluid injection into disposal wells had been large enough to be felt by people on numerous occasions

that are usually too small to be detected at the surface, and tremors attributed to fluid injection into disposal wells have been large enough to be felt by people on numerous occasions

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