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The correct answer is:
$1,500.
The fixed costs are those costs that remain unchanged irrespective of activity levels. The information given in the question regarding the activity levels is therefore irrelevant.
$4,800 is incorrect. You have calculated the total costs incurred at the given activity level, not the fixed costs.
$3,500 is incorrect. The fixed costs are those costs which are unaffected by changes in activity levels，which could be calculated by considering the total costs if both production and sales levels were 0.
$3,300 is incorrect. You have calculated the total variable cost incurred at the given activity level, not the fixed costs.