Choice "D" is correct. The common law defense of fraud requires a showing of intent to deceive. Fraud in the inducement (as opposed to fraud in the execution) merely means that the victim was deceived as to the reason for the transaction.
Choice "a" is incorrect. A person need not be an expert concerning the subject matter of the deceit to be liable for misrepresentation. The person need only knowingly lie.
Choices "c" and "b" are incorrect. Fraud in the inducement means that the victim was deceived as to the reasons for entering into the fraudulent transaction; there is no requirement that the misrepresentation have been made in writing, so "c" is incorrect. Similarly, there is no requirement of a fiduciary relationship, so "b" is incorrect.