Refer to Figure 3-21. Suppose Azerbaijan is willing to trade 3 nails to Uzbekistan for every bolt that Uzbekistan makes and sends to Azerbaijan. Which of the following combinations of bolts and nails could Uzbekistan then consume, assuming Uzbekistan specializes in making bolts and Azerbaijan specializes in making nails? a. 7 bolts and 70 nails b. 12 bolts and 56 nails c. 17 bolts and 40 nails d. 25 bolts and 15 nails