Sentence Correction

The parents of a baby born with spina bifida say that had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they might have chosen to abort the pregnancy.

(A) had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they might have chosen to abort the pregnancy

(B) had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they would have chosen to abort the pregnancy

(C) they might have chosen to abort the pregnancy if they had known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain

(D) if they had known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they might have chosen to abort the pregnancy

(E) they might have chose to abort the pregnancy had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain

I have two questions:

What is the problem in C?
Why is the answer A?

Experts, please explain.

I am confused between A &B

I would go for B.

Experts please explain

gmat_Tutor wrote:The parents of a baby born with spina bifida say that had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they might have chosen to abort the pregnancy.

(A) had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they might have chosen to abort the pregnancy

(B) had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they would have chosen to abort the pregnancy

(C) they might have chosen to abort the pregnancy if they had known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain

(D) if they had known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain, they might have chosen to abort the pregnancy

(E) they might have chose to abort the pregnancy had they known the child would be born with a disabling defect that can result in paralysis, profound learning disabilities and fluid on the brain

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