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, ceteris paribus.Complete the table by calculating the required opportunity costs for brushes and combs.

\begin{array}{|c|c|c|c|c|c|}\hline & \begin{array}{c}\text { Number } \\\text { of } \\\text { Brushes }\end{array} & \begin{array}{c}\text { Opportunity Cost } \\\text { of Brushes in } \\\text { Terms } \\\text { of Combs }\end{array} & \begin{array}{c}\text { Number } \\\text { of Combs }\end{array} & \begin{array}{c}\text { Opportunity Cost } \\\text { of Combs in Terms } \\\text { of Brushes }\end{array} \\\hline \mathrm{J} & 0 & & 4 & \\\hline \mathrm{K} & 10 & & 3 & \\\hline \mathrm{L} & 17 & & 2 & \\\hline \mathrm{M} & 21 & & 1 & \\\hline \mathrm{N} & 23 & & 0 & \\\hline\end{array}

\text {Table \(1.3\)}

\text {Production Possibilities for Brushes and Combs}

On the basis of your calculations in Table 1.3, what is gained by producing at point M rather than point N?
A)23 combs.
B)21 combs.
C)1 comb.
D)2 combs.

Refer to Figure 1