All of the Following Statements Are True About External Validity

Multiple Choice

All of the following statements are true about external validity except ________.

A) threats to external validity arise when the specific experimental conditions do not realistically take into account the interactions of other relevant variables in the real world.
B) external validity is the basic minimum that must be present in an experiment before any conclusion about treatment effects can be made
C) factors that threaten internal validity may also threaten external validity,the most serious of these being extraneous variables.
D) A and C are true