This is a statistical argument. The officials assert that there is in fact no increase in actual mishaps during the months after an accident, but an increase in the number of news sources reporting the mishaps— in other words, they argue that the statistics are not representative. To weaken this assertion, we would have to show that the statistics are in fact representative. (B) does this by implying that certain months are more likely to have more frequent accidents due to high volume of flights. Choice (A) is outside the scope of the argument. (C), (D), and (E) would all strengthen the assertions of the officials.