In Order to Examine Environmental Factors That Influence Alcohol Consumption,Henry

Multiple Choice

In order to examine environmental factors that influence alcohol consumption,Henry asks the same set of participants to come to the laboratory on several consecutive occasions and fill out a questionnaire before drinking any alcohol.Henry finds that over time,fewer and fewer participants show up to fill out the questionnaire.This lack of continued participant involvement is an example of a _____ problem.

A) selection
B) mortality
C) regression toward the mean
D) testing