devendra.c thr3atI'll reassert that it's wise not to try to learn from questions like this. It's not good for your score. I'm just jumping in now to comment on the reasoning above. We don't want to play the game of "this weakens more things or more fully." That isn't how CR is supposed to work. If a statement makes the conclusion less likely to follow from the premises, then it weakens, regardless of whether it covers the full scope of the argument. If anything, one could say that E is a *less* effective weaken than C, since it doesn't allow us to compare the overall loss from this mutual fund to the loss we might incur from others. But again, either the answer weakens or it doesn't.
In this case, it's worth noting that the narrowness of C in no way limits its effectiveness as a weakener. If the author asserts that something is the most/least, and some other item turns out to exceed it, then the conclusion is false. C tells us that some stocks have lost more than 25%, so it's clearly NOT true that VBMF has lost as much as any other. C literally disproves the argument. Sure, there could be other factors--other than the dividends mentioned in E, there could be differences in tax liability, fees, etc., but the key idea is still that we only need one exception to disprove a generalization. Similarly, if I say that I'm the tallest person in the world, and my neighbor is taller, then I'm wrong. We don't need to compare me to everyone else around the world. If one person is taller, I'm not the tallest. If one fund has greater losses, then this one doesn't involve "as least as much" loss as any other.
But really, put this one to bed. Real CR questions have one answer, and are more clearly written, and there are enough real CR questions out there to last you through test day.