please answer correctly, and write why is not that option in detail

C) a decrease of D) an increase of $60,000 20. In a particular year a certain investment project generated revenue of $200,000. Other expenses (excluding depreciation and interest expense) totaled $100,000. Depreciation expense was $50,000 and interest expense was $10,000. The firm faces a tax rate of 21%. What is the project's after-tax operating cash flow in this year? A) $89,500 B) $81,600 C) $129,000 D) $79,000