Which of the Following Statements About the Role of Research

Multiple Choice

Which of the following statements about the role of research procedures in external validity is/are TRUE?

A) Responses to similar stimuli can vary greatly from culture to culture.
B) Research findings can become obsolete over time, so researchers should conduct replication studies to assess whether the results are vulnerable to change.
C) Research designs should take into account the amount of time required for an independent variable to have an effect.
D) All of the above are true.