Answer: C) Rafa should continue to produce at a loss in the short run.
Explanation:
Rafa should continue to produce in the short run because he stands a chance of making profit in the long run. His avoidable fixed costs are $600 and his Economic profits are -$500. In the long run, all costs are variable which means that he should be able to avoid the $600 fixed costs. When he does this, he will then be making an Economic profit of $100 because the $600 in Avoidable fixed cost will be just that, avoided and when that is offset against the -$500, he will get a $100 profit.