Considering the socio-psychological theory, and according to Berkowitz, when frustration is unjustified, aggression cues combine with anger to cause aggression.
The research studies have found that aggressive cues combined with anger can activate aggression in humans.
The research shows that anger instigates aggressive cues, thereby forming a complete aggression response in humans.
Hence, in this case, it is concluded that the correct answer is "anger."
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