A firm has three different investment options, each costing $10 million. Option A generate $12 million in revenue at the end of one year. Option B will generate 5 million in revenue at the end of two years. Option C will generate $18 million in enue at the end of three years. Which option should the firm choose? a. Option A b. Option B c. Option C d. The answer depends on the rate of interest, which is not specified here