A company wants to assess employee satisfaction. They distribute a voluntary online survey to all employees and only analyze responses from those who complete it. What type of bias is most likely to affect the survey results?

The correct answer to the question "A company wants to assess employee satisfaction. They distribute a voluntary online survey to all employees and only analyze responses from those who complete it. What type of bias is most likely to affect the survey results?" is Option B: Response bias.

The other options — A) Selection bias, C) Confirmation bias, D) Observer bias — are incorrect for this GMAT Exam Prep question. As explained above: Response bias (specifically non-response bias) occurs when only a subset of the target population chooses to participate, often leading to a skewed representation of opinions.