What Does the Process of Collective Action Tell Us About

What does the process of collective action tell us about why consensus is hard to come by?

A) Individuals want outcomes at their ideal points and refuse to engage in bargaining and compromise.
B) Since power is dispersed across different institutions, there is a lack of coordination.
C) Any legislation will have policy winners and losers when societal goals are at odds with individually rational actions.
D) The system of separation of powers was not designed to handle the levels of polarization that exist in the current political system.