On Tuesday fifty-two people ate ham sandwiches at Johnny's Deli, and half of those came down with hepatitis. The board of health discovered that the people who became ill had their ham sandwiches made by Johnny's brother, who had hepatitis at the time. This was the only relevant common element among those who got sick. It seems that Johnny's brother is the source of the hepatitis.1. Analogical Argument2. Sampling Argument3. Argument from Authority4. Causal Argument