Dr DeJong Randomly Selects 100 Individuals to Participate in an Experiment

Multiple Choice

Dr. DeJong randomly selects 100 individuals to participate in an experiment. She then randomly assigns the participants to several different conditions. With reference to the potential threats to validity described in your text, what are the goals of random selection and random assignment, respectively

A) Both random selection and random assignment protect the external validity of the research.
B) Random selection protects the external validity of the research.Random assignment protects its internal validity.
C) Random selection protects the external validity of the research.Random assignment protects its construct validity.
D) Random selection protects the construct validity of the research.Random assignment protects its internal validity.