In the eighteenth century, many liberal thinkers believed that representative institutions could defend the liberty and interests of the people. In terms of political practice, this meant that

Voting for representatives would be restricted to men of property,  is the right answer.

Explanation:

Liberalism is a political doctrine with the protection and enhancement of individuals'  freedom at its core. Though they believed that the intervention of government is necessary to protect the people of the state, they also recognized that the government can sometimes also pose a threat to the liberty of the people. Accordingly, in the eighteenth century, they believed that the liberty and interest of people can be defended by representative institutions, which means that voting for representatives would be limited to men of property.

d is the best answer for this question.

they died with poison from the god patrick