In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select theappropriate option. If a sentence is free from error, select 'No Error'.
She was (1)/ quite amusing (2)/ at that story. (3)/ No error (4)
If the ___________ firm has zero costs or only has fixed cost, the quantity supplied in equilibrium is given by the point where the marginal revenue is zero.