Last year, engineers at a local software firm developed a new approach for dealing with increasingly troublesome cyber

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Last year, engineers at a local software firm developed a new approach for dealing with increasingly troublesome cyber attacks, an advancement that has already reduced successful attacks by over 50%.


(A) an advancement that has already reduced successful attacks by over 50%

(B) an advancement that had already reduced successful attacks by over 50%

(C) and it is an advancement that reduced successful attacks by over 50%

(D) and is an advancement that has already reduced successful attacks by over 50%

(E) and an advancement that has already reduced successful attacks by over 50%


OA A

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This sentence says that engineers at a local software firm developed a new approach to dealing with cyber attacks and this advancement or approach developed has already reduced the attacks by 50%.

Option A - correct
This option is correct because it uses the correct tense of verb which is the present perfect tense, to explain the intended meaning of the sentence.

Option B - incorrect
The past perfect tense of the verb 'had' used with the phrase 'already refused' implies that the attacks were already reduced before the advancement was developed.

Option C - incorrect
The verb tense used is incorrect. It doesn't show the chronological order for the course of action as intended in the sentence.

Option D - incorrect
Adding 'and is' to the sentence is structurally wrong. It functions as a subordinate clause instead of an independent clause.

Option E - incorrect
Although the sentence suggests that there's a development of technology and the advancement reduces cyber attacks. It doesn't show a relationship between new technology and advancement.