Answer:
A)random assignment.
Step-by-step explanation:
Random assignment: In psychology, the random assignment is defined as the utilization of chance procedures in any of the psychological experiment to confirm that each subject that is being chosen in the study has got the equal opportunity to be assigned or selected in a particular group.
Every participant or the subjects are equally assigned to different groups (treatment group, experimental group) during an experiment, research, or study.
In the question above, the statement signifies the random assignment.