During an Experiment a Researcher Decides to Assign Participants to the Experimental

During an experiment a researcher decides to assign participants to the experimental and control groups based on their birthdays. The participants are juvenile offenders. Those born from January through June are assigned to the experimental group. The participants born from July through December are assigned to the control group. The experiment involves an assessment of academic achievement on the onset of juvenile delinquency. What type of threat to the external validity of this experiment's re

A) Reactivity
B) Selection bias
C) The combination of a and b.
D) Neither a nor b. There is no potential threat to external validity.

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