Question

There is a long list of terror attacks in who the security establishment failed to carry out a scientific probe

In each question below, a sentence is given with a part of it printed in bold type. That part may contain a grammatical error. Each sentence is followed by phrases 1, 2, 3 and 4. Find out which phrase should replace the phrase given in bold to correct the error, if there is any, and to make the sentence grammatically meaningful and correct. If the sentence is correct as it is and ‘ No correction is required’ , mark 5 as the answer.
A in who the security
B in which the security
C in who the securities
D in which a securities5 No correction required
E No correction required
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