The best answer to this question is A.
Liberalism was an ideology that pretty closely resembled the beliefs that we have in the United States today. Liberalism is based very strongly on the idea that individual people have rights and that the government should have to honor those rights. As the link below says, liberalism is
... a set of attitudes, including particularly an emphasis on the recognition of the rights of the individual and tolerance, which permits considerable diversity of views among liberals.
As you can see from this quote, liberalism is quite clearly an ideology that is based more than anything else on the idea that people should be able to express their points of view on various issues. Therefore, the best answer is A.