Which of your text's unifying themes is illustrated by the fact that research results can be affected by experimenter bias

A)  Psychology is theoretically diverse. 
B)  People's experience of the world is highly subjective. 
C)  Behaviour is shaped by our cultural heritage. 
D)  Behaviour is determined by multiple causes.

Experimenter Bias

A type of bias that occurs when a researcher unconsciously influences the outcome of a study based on their expectations.

Unifying Themes

Central ideas or concepts that bring together various disparate elements into a coherent whole.

Research Results

The findings or outcomes derived from scientific or academic investigation.