The word that best completes the underlined word from the given sentence is:
From the given question, we can see that an action is about to be taken, but there is a problem that cannot allow them to proceed. This problem is a bug snowstorm which has stopped all vehicular and air travel.
As a result of this, we need to use a word that highlights this problem and shows the reason why the regional sales meeting cannot proceed as planned.
Therefore, the correct answer is option D because the transitional word "Since" is used to show why the meeting could not take place.
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