Sentence Correction (SC) | Re: Although pneumonia is not often dangerous, it is so expensive to treat

Although pneumonia is not often dangerous,it is so expensive to treat that it has become a financial threat to many families.
A.it is so expensive to treat that it has become afinancial
CORRECT
B.it isof such expense that it has becomefinancially
C.it is soexpensive that it has become a financial
D.such is its expense that it has become a financial
E.there is so much expense that it has become afinance[/quote]
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