Which of these is a negative impact of lobbying? a- it makes businesses too transparent. b- it favors groups over the individual. c- it enables outsiders to influence lawmakers. d- it offers advantages to those with money.

D is the best answer. 
Although lobbying generally favors groups over the individual, this isn't necessarily a bad thing, and gives a larger voice to groups with shared interests than the sum of their individual voices.
However, an ugly side of lobbying is that money often makes a group's voice a lot louder, and gives more direct influence over the political official through the ability to donate generously to campaigns.