Answer:
1. between-subjects
Step-by-step explanation:
Between-subjects experiment: In psychological or scientific research, the term between-subjects experiment is one of the types of experimental design whereby the subjects or participants of an experiment or research are being assigned under different conditions and therefore each subject or participant will experience only one experimental condition.
The between-subject design is being widely used in the field of social science.
In the question above, the given statement represents the between-subjects experiment.