Identify the Best Standard-Form Representation of the Argument in the Passage

Identify the best standard-form representation of the argument in the passage:
The passage: "Parkinson's Disease, like every other disease, must be caused either by inherited genetic factors or by environmental factors. Examples of inherited diseases are sickle cell anemia, cystic fibrosis, and Huntington's disease. Examples of environmentally caused diseases are skin cancer and lead poisoning. The evidence is strong that there is, in most cases, no inherited cause of Parkinson's. (One especially strong piece of evidence: it appears to be the case that the children of parents with Parkinson's are no more at risk of developing the disease than are people in the general population.) Given this evidence, we can conclude that Parkinson's is caused by environmental factors."

A) 1) Examples of inherited diseases are sickle cell anemia, cystic fibrosis, and Huntington's disease
2) Examples of environmentally caused diseases are skin cancer and lead poisoning.
3) Children of parents with Parkinson's are no more at risk of developing the disease than are people in the general population
So, Parkinson's Disease, like every other disease, must be caused either by inherited genetic factors or by environmental factors
B) 1) Examples of environmentally caused diseases are skin cancer and lead poisoning.
2) Parkinson's Disease, like every other disease, must be caused either by inherited genetic factors of by environmental factors.
So, Parkinson's Disease is caused by environmental factors.
C) 1) Parkinson's Disease must be caused either by inherited genetic factors or by environmental factors.
2) Parkinson's Disease is not caused by inherited genetic factors. So, Parkinson's Disease is caused by environmental factors.
D) 1) Children of parents with Parkinson's are no more at risk of developing the disease than are people in the general population.
2) Parkinson's Disease, like every other disease, must be caused either by inherited genetic factors of by environmental factors.
So, Parkinson's Disease is caused by environmental factors.