After graduating college Allen wants to start a business selling hats. He has saved $10,000 which will be enough for the startup costs for his online store. His dad thinks that he should instead invest in a mutual fund that pays 3% per year. If Allen will have materials and labor costs of $4,000 per year and expects a total revenue of $5,500 per year, what is his opportunity cost of starting this business? Group of answer choices b. His opportunity cost is the $300 he would have earned from the mutual fund. d. Opportunity costs is not measured in dollars, but only the time he will spend on his business. a. There is no opportunity cost because he is making a profit. c. The opportunity cost is $10,000 because he will have to spend that to start the company