Final answer:
The statement that indicates an increased likelihood of violent behavior is "I often lose control when things don't go my way," suggesting a tendency towards aggressive reactions in stressful situations.
Step-by-step explanation:
Among the statements provided by Ian, the one that indicates an increased likelihood of violent behavior is: D) "I often lose control when things don't go my way." This statement suggests a propensity for losing emotional control, which is associated with aggressive and potentially violent reactions when faced with challenging or unfulfilling situations. Behavioral patterns that include quick-tempered reactions and hostility, similar to the case of Jeffrey, who exhibits Type A behavior pattern, are correlated with both interpersonal conflicts and health issues like heart disease. Kaitlin's example, who demonstrates confrontational behavior and rehearses confrontations, also demonstrates how hostile dispositions can create antagonistic environments and further stimulate aggressive behaviors.