When the Citizens United Decision Was Handed Down, a Flood

When the Citizens United decision was handed down, a flood of corporate cash was expected to enter the political system. The ruling did result in more corporate and union spending, but far less than anticipated because _________.
A) many companies were reluctant to take stands that might alienate a large number of customers
B) many companies were running losses as a result of an economic recession
C) political parties refused to accept money from private corporations and unions
D) political parties wanted a more reliable source of funds to finance their ongoing political campaigns