During the past decade, the labor market in France has not been operating according to free market principles, but instead stifling functioning through its various government regulations restricting the hiring and firing of workers.
A)principles, but instead stifling functioning through its various government regulations restricting the hiring and firing of workers
B)principles, instead it has been functioning in a stifled manner as a result of various government regulations that restrict the hiring and firing of workers
C)principles, rather functioning despite being stifled as a result of government regulations that variously restrict worker hiring and firing
D)principles; the hiring and firing of workers is restricted there by various government regulations, its functioning being stifled
E)principles; instead, its functioning has been stifled by various government regulations restricting the hiring and firing of workers
What is the best way to attack such questions in the least time possible. In the given question I couldn't find any obvious mistakes, pronouns,modifiers etc but definitely knew the grammatical construction was wrong. Scanning the choices vertically doesn't help here. And Reading each choice horizontally took me 1:44 minutes to solve this question.