Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinson' s disease. This fact shows not only that these neurotoxins cause this type of brain damage, but also that the brain damage itself causes Parkinson' s disease. Thus brain scans can be used to determine who is likely to develop Parkinson' s disease. The argument contains which one of the following reasoning errors?
A: It overestimates the importance of early diagnosis in determining appropriate treatments for people suffering from Parkinson's disease.
B: It neglects to specify how the information provided by brain scans could be used either in treating Parkinson's disease or in monitoring the progression of the disease.
C: It assumes that people would want to know as early as possible whether they were likely to develop Parkinson's disease.
D: It mistakes a correlation between the type of brain damage described and Parkinson's disease for a causal relation between the two.
Choose A, B, C or D as your solution.
A