What is the independent variable?

A scientist-practitioner has had several clients seeking services for restricted response patterns. The researcher wants to test the efficacy of several methods and decides to start with differential reinforcement of alternative behaviors with extinction. Over time, participants’ client’s restricted response patterns improved. What is the independent variable?
A) Differential reinforcement of alternative behaviors
B) Differential reinforcement of alternative behaviors with extinction
C) Restricted response patterns
D) Extinction

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