When preparing flexible budget, the following information is for ABC Corporation: Direct Materials (measured in pounds) Standard price per unit of input $20 Actual price per unit of input $18 Standard inputs per unit of output 3 pounds Actual units of input 8,300 pounds Actual units of output 2,770 units What is the flexible budget variance for direct materials? Select one: a. $16,800 Unfavorable b. $16,400 Favorable c. $16,400 Unfavorable d. $16,800 Favorable