Exxon Mobile owns an oil lease on a tract of land. Actual extraction of oil may be done fairly quickly. If Exxon Mobile extracts immediately, you will earn $200 million. However, oil prices are expected to rise 15% per year for four years, 12% per year for the following 2 years, 8% per year for the following 3 years and 5% per year thereafter for the foreseeable future. The opportunity cost of capital for this project is 7.5%. When should you extract the oil? Extract in year 6. D Extract in year 9 Extract in year 4. a Never extract it