Question Explanation
Since the underlined portion of the sentence completes the idiom that begins in the non-underlined portion of the sentence with the word farther, check whether the idiom is constructed correctly. This sentence uses the construction farther when compared, an incorrect form of the idiom farther than. This is an idiom error, so eliminate choice A and look for any obvious repeaters. There are no obvious repeaters, so evaluate the remaining answer choices individually looking for reasons to eliminate each.
Choice B uses the construction farther as compared, an incorrect construction of the idiom farther than, so eliminate choice B. Choice C uses the construction farther by comparison, an incorrect construction of the idiom farther than, so eliminate choice C. Choice D fixes the idiom error by using the correct idiomatic construction farther than, but it incorrectly compares Mike Powell to distance, so eliminate choice D for a comparison error. Choice E fixes the idiom error by using the correct idiomatic construction farther than and introduces no new errors, so keep choice E.
Choice A: No. Farther when is an incorrect form of the idiom farther than. Idiom.
Choice B: No. Farther as is an incorrect form of the idiom farther than. Idiom.
Choice C: No. Farther by is an incorrect form of the idiom farther than. Idiom.
Choice D: No. Mike Powell is incorrectly compared to distance. Comparison.
Choice E: Correct.
The correct answer is choice E.