Final answer:
Clashes between opposing groups can be intensified by in-group favoritism and out-group derogation.
Step-by-step explanation:
When opposing groups clash, the conflict is often amplified by a) In-group favoritism, b) Out-group derogation, c) Social identity theory, or d) Intergroup competition. In-group favoritism refers to the preference for one's own group over other groups, while out-group derogation involves viewing the out-group as inferior. These biases can contribute to the escalation of clashes between opposing groups.