An integrated understanding of Tara's consistent cheerfulness in terms of her supportive peer relationships,her calm temperament,and her perceived internal locus of control best illustrates

A) factor analysis.
B) self-serving bias.
C) a biopsychosocial approach.
D) positive psychology.

The mention of Tara's supportive peer relationships, calm temperament, and perceived internal locus of control suggests a holistic approach that considers biological, psychological, and social factors that may be contributing to her consistent cheerfulness. This is consistent with the biopsychosocial approach, which seeks to understand health and wellbeing through an integration of multiple levels of analysis. Factors such as positive psychology and self-serving bias may also be relevant, but do not capture the full range of factors highlighted in the scenario. Factor analysis is a statistical technique for identifying underlying dimensions of a set of variables, which is not directly relevant to Tara's situation.