Ruth sold land she purchased three months earlier for use in her business. Her cost and adjusted basis in the land is $75,000. She incurred selling expenses of $5,000. The buyer paid $80,000 cash and assumed Ruth's $25,000 mortgage on the property. What is the amount of her gain, and where on Form 4787 will she report the sale? A. $25,000 on Part I, B. $25,000 on Part II, C. $30,000 on Part III, D. $30,000 on Part IV