Along with three other workers, Helena works in a factory that makes plastic phone cases. The four main tasks are mixing, molding, curing, and polishing. Out of all the workers, she is the slowest mixer, has the highest opportunity cost for molding, has the lowest opportunity cost in curing, and hates polishing the most. If her manager makes assignments in a way that maximizes factory output, then she will be assigned to Select one: a molding. b. mixing. c. polishing d. curing