How Did the Australian Ballot Change the Nature of Political

How did the Australian ballot change the nature of political competition?

A) It made it easier for third parties to participate in elections because the state printed the names of all candidates for an office on a single ballot.
B) It was much more difficult for parties to exchange favors for votes because it left no legal way for the parties to know if voters kept their side of the bargain.
C) It enabled the political parties to access to elective public office by controlling nominations.
D) It strengthened the political parties because the new ballot form made it much easier to vote a straight party ticket.