Source: Knewton

In a shock to those who still lived under the impression that investments are closely monitored, a financial security group recently discovered a loophole for enabling a scammer to gain access to transactions made by a leading investment bank so that this person will be aware of any major deals that a corporation had made before these deals are announced to the public


(A) who still lived under the impression that investments are closely monitored, a financial security group recently discovered a loophole for enabling a scammer to gain access to transactions made by a leading investment bank so that this person will be aware of any major deals that a corporation had made

(B) who had still been living under the impression that investments are closely monitored, a financial security group recently discovered a loophole for enabling a scammer to gain access to transactions made by a leading investment bank so that this person was aware of any major deals that a corporation might have made

(C) who still were living under the impression that investments are closely monitored, a financial security group recently discovered a loophole enabling a scammer to gain access to transactions made by a leading investment bank so that this person will be aware of any major deals that a corporation had made

(D) still living under the impression that investments are closely monitored, a financial security group recently discovered a loophole that enables a scammer to gain access to transactions made by leading investment banks so that this person is aware of any major deals that a corporation might make

(E) still living under the impression that investments had been closely monitored, a financial security group recently discovered a loophole that will enable a scammer to gain access to transactions made by leading investment banks so that this person was aware of any major deals that a corporation might make
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I will provide explanation further.
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what I did is that I quickly eliminated any option that has past perfect tense at the end of the sentence, so I was left with B and D.
I eliminated B because of the past perfect at the beginning of the sentence (who had still been living) that means they are not in a shock anymore which contradicts the meaning of the sentence. That leaves D
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