It eroded it because the colonists were forced to fight the French on the American territories. They didn't want to do this because the French were good trading partners and the colonists had good relations with them, so they became unsatisfied that they were drawn into a war that was against their well being by the British.
In short, Germany was close to being defeated, and America wanted to be part of the post war carve up (when territory was divided). The US was supplying war materials to the Allies and could not do so while maintaining complete neutrality. There was also the sinking of the British ship Lusitania which angered the US. Also, the Zimmerman telegram.
The answer here would be A. because free market eco is people mostly just trading goods for goods, with no government interference.
