Which of the Following Descriptions Is a Definition of the Confirmation

Which of the following descriptions is a definition of the confirmation bias?

A) tendency to seek out evidence that confirms a claim or belief, while ignoring evidence that contradicts or undermines the claim or belief
B) belief that irrefutable or nonfalsifiable claims can be used to confirm the existence of pseudoscientific methods and practices.
C) tendency for subtle cues or signals, expressed by the researcher, to bias participants so that they attempt to confirm the hypothesis being tested
D) belief that testimonials are the best type of empirical evidence to confirm pseudoscientific claims