个人感觉在GMAT中,which一般都用于指代其前面的那个词,在本题中就是指“disparate effect",但本句是用that is后面的that screen out a percentage of minorities or women disproportionate to来解释Not all employment selection mechanisms that have a “disparate effect"。如果这样理解,which means就不对了。不知这样理解对不对?