Mike has received a shipment of fish. In order to kill any parasites, he must _____.

A. cook the fish at a temperature of 135 degrees F
B. cook the fish immediately
C. freeze the fish at a temperature of -4 to -20 degrees F for 24 hours
D. freeze the fish at a temperature of -4 to -20 degrees F for 7 days
(Food and safety class)