All of the Following Statements Indicate the Risks That Attrition

Multiple Choice

All of the following statements indicate the risks that attrition presents for an experiment, EXCEPT:

A) People dropping out of the experimental group may have different characteristics than people dropping out of the control group.
B) Participants in any experiment can withdraw at any time so attrition risks are the same for all experiments.
C) Attrition can especially bias the results of an experiment that places high demands on its participants.
D) Differential attrition can affect the generalizability of the results of a long experiment.