The Church’s response to feudalism included various measures aimed at addressing the social and moral issues that arose from the feudal system. Among the options provided, the Truce of God is the one meant to counteract what the Church saw as the "general failure of feudalism."
The Truce of God was a movement initiated by the Church in the medieval period to limit the violence and warfare that were rampant due to feudal conflicts. It aimed to establish specific periods during which fighting was prohibited, reflecting the Church's desire to promote peace and stability in society, which were undermined by incessant feuds and battles among the feudal lords.
In summary, while all the other options relate to the structure and function of feudalism, it is the Truce of God that specifically addresses the Church's concerns about the failures of this system.