Final answer:
Walter cannot deduct the legal expenses as a business expense but he can deduct the legal fees if the tax deficiency relates to income other than business income.
Step-by-step explanation:
Walter cannot deduct the legal expenses as a business expense (Statement I) because the tax deficiency does not relate to his business. However, he can deduct the legal fees if the tax deficiency relates to income other than business income (Statement II). Therefore, the correct answer is e. Statements I and III are correct.