The non - underlined portion has two pronouns - they and their. We want to make sure we are associating these with correct subject.
Plus - the first sentence is modifying "customs officers" because they are the one who do the explaining.
Thus, right after the modifying clause, the subjecdt its modifying should appear.
Only D and E has that. D - just because it is in passive voice, does not make it incorrect.
D - structure of D is hypothetical subjunctive. D is the correct choice.
...
Plus - the first sentence is modifying "customs officers" because they are the one who do the explaining.
Thus, right after the modifying clause, the subjecdt its modifying should appear.
Only D and E has that. D - just because it is in passive voice, does not make it incorrect.
D - structure of D is hypothetical subjunctive. D is the correct choice.
...
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