Critical Reasoning (CR) | Re: Some soil scientists have asserted that decaying matter on the forest

 Some soil scientists have asserted that decaying matter on the forest floor is a far greater source of the acidity in mountain lakes than is the acid rain that falls on these lakes. Therefore, they contend, reducing acid rain will not significantly reduce the acidity levels of mountain lakes.

Which of the following statements, if true, most seriously weakens the argument above?

(A) It is natural for mountain lakes to have acidity levels higher than those of other lakes.
(B) The harmful effects of increased acidity levels in lakes have been greatly underestimated.
(C) Acid rain is found in urban and heavily industrialized regions of the country.
(D) There is much disagreement among soil scientists about the causes of acid rain.
(E) While plant life remains, acid rain significantly increases the amount of decaying organic matter in naturalenvironments.