(B) says, "presumes, without providing justification, that the public has a right to all information about matters of public safety"
The problem with (B) is that the argument never claims that the public should have access to all safety-related information, so (B) is describing something that does not occur in this argument. Thus, we can get rid of it.
(D) says, "presumes, without providing justification, that airlines, rather than the government, should be held responsible for accurate reporting of safety information"
The problem with (D) is that the argument does not make any claims about who should be held responsible for accurate reporting, so we can get rid of this choice.
(A) says, "fails to consider that, even if the reports are incomplete, they may nevertheless provide the public with important information about airline safety"
As (A) notes, the argument does not consider that the reports could be incomplete but still be useful to the public. Thus, (A) describes where the argument is most vulnerable to criticism, so this is the correct answer choice.
Does this make sense? Let us know if you have any other questions!