The Main Difference Between Internal Validity and External Validity Is

Multiple Choice

The main difference between internal validity and external validity is that:

A) external validity concerns the degree to which the experiment supports clear causal conclusions,while internal validity concerns the generalizability of the results.
B) internal validity concerns the degree to which an experiment supports clear causal conclusions,while external validity concerns the generalizability of the results.
C) internal validity is based on random sampling,while external validity is based on random selection.
D) internal validity is based on dependent variables,while external validity is based on independent variables.