Discussion

Explanation:

In this question, it is easy for us to spot the opening sentence. It brings the action from the past (1990s) into the present. For this reason, 3 is in the present perfect continuous form, and 1 is in the simple present form. Thus 31 form a pair. 4 has the pronoun “these concerns”. It refers to the noun “pressing security concern” in 2. Thus 24 form a pair. The right sequence has to be 3124.

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