\begin{tabular}{l} If Boeing produces 9 jets per month, its long-run total cost is $$ \$ 9 $$ \ million per month. If it produces 10 jets per month, its long-run total \ cost is \$11 million per month. Boeing exhibits _- \ \hline OA) rising marginal cost. \ \hline OB) falling marginal cost. \ \hline OC) economies of scale. \ \hline\end{tabular}

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To determine the correct answer, we need to analyze the information provided about Boeing's production costs at different levels of output.

1. **Understanding the Costs:**
   - When Boeing produces 9 jets, the total cost is $$ \$9 $$ million.
   - When Boeing produces 10 jets, the total cost is $$ \$11 $$ million.

2. **Calculating Marginal Cost:**
   - The marginal cost (MC) is the additional cost incurred by producing one more unit of output. 
   - To find the marginal cost of producing the 10th jet, we can use the formula:
     $$
     MC = \frac{\Delta \text{Total Cost}}{\Delta \text{Quantity}} = \frac{11 - 9}{10 - 9} = \frac{2}{1} = 2 \text{ million}
     $$
   - This means that the cost of producing the 10th jet is $$ \$2 $$ million.

3. **Analyzing the Options:**
   - **Rising Marginal Cost (Option A):** This occurs when the marginal cost increases as production increases. Since the marginal cost of the 10th jet is higher than the cost of producing the previous jets, this suggests that marginal costs are rising.
   - **Falling Marginal Cost (Option B):** This would mean that the cost of producing additional units decreases, which is not the case here.
   - **Economies of Scale (Option C):** This refers to a situation where increasing production leads to a lower cost per unit. In this case, the cost per unit is increasing as production increases from 9 to 10 jets.

Based on the analysis, the correct answer is:

**A) rising marginal cost.**
Boeing exhibits rising marginal cost.

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