Carol Carpenter and Harry Household enter into a written contract for Carol to remodel Harry's basement at her usual rate of $5/hour. Both parties miss the typo and know that Carol's usual rate is $50/hour, but Harry insists on the validity of the written contract.

A. Carol must do the work here for $5/hour since that is what was agreed to by her in the written contract

B. Carol can introduce parole evidence to prove her usual hourly rate was $50.

C.Harry can void the contract due to this typographical error.

D. None of the above