Veruca sells therapeutic bath salts on the Internet. Her annual revenue is​ $52,000 per​ year, the explicit costs of her business are​ $14,000, and the opportunity costs of her business are​ $17,000 per year. What is her accounting​ profit? A. ​$14,000 B. ​$21,000 C. ​$31,000 D. ​$38,000