I think that avoidance is of the lowest severity simply because the problem is not his, however depending on the drawback to that product function it can be a difficult decision to make. I think that the highest severity would be acceptance because if you would assume the same risk as you did the as you did with avoidance then depending on the product the decision can be just as difficult. However, the if something is dangerous enough to remove it is far more dangerous to ignore. I think that acceptance do not reduce the risk level.