Answer:Assumption of Risk
Explanation: Assumption of risk is a type of legal theory that can be used by any defending person during a particular situation. This theory states that the blaming individual knew about the risk or danger that he/she has taken but still chose to be in that situation voluntarily.
According to the case mentioned in the question , the baseball team can defend theirselves by stating that Rick knew about the home run area but still took the seat there and ignored the risk.Thus, Rick is himself is responsible for the damage caused to him.