OFFICIAL EXPLANATION:
The underlined portion of the sentence contains a list of things a customer can do, so check that these verbs are parallel. Additionally, the sentence includes the pronoun their, so check that it agrees with its intended subject. The underlined portion lists that a customer can watch…and uses, which are not matching verb tenses, so this is a parallel construction error. The plural pronoun their does not agree with the singular subject the computer manufacturer, so eliminate choice A for parallel construction and pronoun errors, and look for obvious repeaters. Choice B is an obvious repeater of the pronoun agreement error because it also uses the plural pronoun their, so eliminate choice B. Now, evaluate the remaining answer choices individually, looking for reasons to eliminate each.
Choice C fixes the original pronoun agreement error by correctly using the singular pronouns it and its to refer to the singular noun the computer manufacturer but introduces a new parallel construction error by using the plural noun customers, which is not parallel to the singular noun LCD monitor. Eliminate choice C for a parallel construction error. Choice D fixes the original pronoun agreement error by correctly using the singular pronouns it and its to refer to the singular noun the computer manufacturer but creates a parallel construction error by using the plural noun customers, which is not parallel to the singular noun LCD monitor. Eliminate choice D for a parallel construction error. Choice E fixes the original parallel construction error by using the parallel verbs watch and utilize, fixes the original pronoun agreement error by using the singular pronoun its to refer to the singular subject the computer manufacturer, and introduces no new errors. Keep choice E.
Choice A: No. The verb can watch is not parallel to uses. The plural pronoun their does not agree with the singular subject the computer manufacturer. Parallel construction; Pronoun agreement.
Choice B: No. The plural pronoun their does not agree with the singular subject the computer manufacturer. Pronoun agreement.
Choice C: No. The singular noun monitor does not agree with the plural noun monitors. Parallel construction.
Choice D: No. The singular noun monitor does not agree with the plural noun monitors. Parallel construction.
Choice E: Correct.
The correct answer is choice E.