Answer:
Causal Argument
Step-by-step explanation:
There is a causal relationship between who made and served the ham sandwiches, and the people who contracted hepatitis.
A causal relation is defined as a situation where the occurrence of one event, causes the occurrence of another event. In this case, Johnny's brother making ham sandwiches leads to the occurrence of hepatitis appearing in half of the people who ordered ham sandwiches from the deli.