Please help me with my final study guide

Input 1 Input 2 Input 3 Price $40 Marginal Product B Roler to the table above. If A - 10, 8 - 15, and @ - 20, which of the following is true? Select ones O A. The firm should buy more of Input | and loss of Inputs 2 and 3. O B. The firm should buy more of Input 2 and less of Inputs 1 and 3. O C. The firm should buy more of Input 3 and less of Inputs 1 and 2. O D. The firm is minimizing costs