105. Table 1.3 shows the hypothetical trade-off between different combinations of brushes and combs that might be produced in a year with the limited capacity for Country X, ceterisparibus. Complete the table by calculating the required opportunity costs for brushes and combs.
On the basis of your calculations in Table 1.3, what is the opportunity cost of producing at point M rather than point N?
A. 23 combs.
B. 21 combs.
C. 1 brush.
D. 2 brushes.