I'm leaning toward B.
The question says "The mechanism is triggered in speicific instances based on estimations of how average invetsors will react to changes in corporate data and economic indicators", it means political events will surely change corporate data and economic indicators.
The key point to the mechanism's effectiveness here is how investors react. See in any political change, the system will be triggered if investors take the event as negative ---> the system works well, If investors take it as positive ---> the system was needless. So B seems correct.
I think it's time for OA.
"Life is like a box of chocolates, you never know what you'r gonna get"