In my understanding
correct answer option should be CCitizens' complaint is about the longer lines at present.
Conclusion is: The citizens' complaints are almost certainly exaggerated, if not altogether unwarrantedoption A indicates nothing significant about the conclusion, it says about an average waiting time of 7 minutes 15 years ago-which gives us nothing.
Certainly Eliminated.
option B says The number of government officials that have direct contact with the public has more than quadrupled over the past 15 years. This may look tempting but this should not be the correct option, because it casts doubt on the citizens' complaint, not the conclusion that the citizens' complaints are exaggerated. This in no way does cast doubt on the conclusion, seems to be supporting it.
option D says about minors or non-adults. Their population increase should not affect the flow of the Govt. offices.
Eliminateoption E says citizens pay visit to the offices at least once a month. Doesn't seem to cast doubt on the conclusion.
Option C says a small percentage of government officials that have joined the civil service in the past 15 years have direct contact with the public. Although the number of officials have quadrupled over the period, waiting time has increased because of the lack of direct contact. This can be our choice because it does cast doubt on the conclusion that the citizens' complaints are exaggerated.
Option should be C