Alex needs to decide whether to go to work today or call in sick. If he goes to work, he will get his daily wage of $73. It costs $20 to get to work. If he calls in sick, he will stay at home and invite his friends over for a party, which he values at $80. The cost of the party which involves renting a movie and getting snacks is $30. What is the best thing for Matthew to do given this information? (a) Go to work as his opportunity cost of working is $50. (b) Go to work as his opportunity cost of working is $30. (c) Call in sick as his opportunity cost of staying at home is $53. (d) Call in sick as his opportunity cost of staying at home is $73.