GMAT Critical Reasoning (CR) | Re: Difficult CR: Chemical Wastes

I stuck between A and B. Can someone elaborate more on the option B?
We are concerned about leaks in the conclusion, which is not neccessarily only leaks from incinerators (I mean we are not told that only leaks from incineration are considered). What if, other ways of disposing chemical, which according to option B are not safer than incineration, can lead to the increase in the leaks. So, with this reasoning, increase in the incineration is not the only way for increase in the leaks.

---