A seems to be idiomatically correct. C and E dont seems to be idiomatically correct. Use of past tense in D is incorrect.

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dvishal387
Firstly, option A is utterly incorrect because it uses "has been" - invention was one time event, and not an ongoing event
Secondly, I don't see any idioms as such in options for the option to be incorrect, and there is hardly any idioms in any of the option.
Thirdly, the option must have a past tense, because the invention happened in twentieth century, so the use of present tense is wrong.

Hope it helps!
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Thanks

Correct Answer must be (E) for the highlighted errors in other options...
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Thanks and Regards

Abhishek....

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KAPLAN OFFICIAL EXPLANATION:

This sentence compares the invention of the printing press to that of the computer, and since the initial, nonunderlined portion of the sentence uses the simple past tense (led), the remainder of the sentence, continuing as it does to discuss a past event, must also use the simple past tense. Therefore, eliminate (A), (B), and (C) for including incorrect verb tenses. (D) and (E) give you different options for the final verb. Since the invention of the computer is the subject of this part of the sentence and is singular, the verb must be singular as well. Eliminate (D), and (E) remains.

An 800 test taker is aware that the subject of a sentence can come after the verb, particularly in constructions beginning with there are or there is.
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