What is meant by the term "selection bias"? Group of answer choices

A. A flaw in measuring exposure or outcome data that results in different quality (accuracy) of information between comparison groups

B. A situation in which a measure of the measure of association between an exposure and health outcome is distorted by a third variable

C. The distortion of a measure of association resulting from the way participants are accepted into studies or drop out of studies

D. Systematic error due to differences in accuracy or completeness of recall to memory of past events or experiences