The answer is the second one (or B): \$400.
To determine the average variable cost (AVC) when 5 units of output are produced, we use the formula:
\[ \text{AVC} = \frac{\text{Total Variable Cost}}{\text{Quantity of Output}} \]
From the table, the total variable cost (TVC) for 5 units of output is \$2,000.
So, we calculate:
\[ \text{AVC} = \frac{\$2,000}{5} = \$400 \]
Therefore, the average variable cost when 5 units of output are produced is \$400.
Explanation for each option:
- \$300: Incorrect. This value does not match the calculated AVC.
- \$400: Correct. This matches the calculated AVC.
- \$100: Incorrect. This value does not match the calculated AVC.
- \$200: Incorrect. This value does not match the calculated AVC.
In summary, the average variable cost of the firm when 5 units of output are produced is \$400.