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Backward chaining begins by teaching the final step first, then progressively adding earlier steps until the whole sequence is mastered. For example, teaching a child to tie shoes by first reinforcing pulling the knot tight. Forward chaining (A) teaches the first step first, total task (C) teaches all steps each trial, and shaping (D) reinforces approximations. Backward chaining is motivating because the learner experiences task completion early.

DRL is used when a behavior is appropriate but occurs too frequently. Reinforcing a student for reducing questions from 10 to 3 per class shapes behavior to socially acceptable levels. Option B is DRO, option C is DRA, and option D is DRI. DRL is often applied in classrooms to reduce excessive but appropriate behaviors like talking, hand-raising, or asking questions.

DRL is used when a behavior is acceptable but needs to occur less frequently. For example, a student who calls out 15 times in class may be reinforced for calling out fewer than 5 times. This decreases excessive behavior without eliminating it entirely. DRO (A) reinforces zero occurrences, DRI (C) reinforces incompatible behaviors, and DRA (D) reinforces alternative behaviors. DRL is often applied in classrooms and social situations to shape more appropriate behavior patterns while still allowing functional use of the behavior.

Response cost is a form of negative punishment in which a previously earned reinforcer is removed following a behavior, decreasing the likelihood of that behavior in the future. For example, removing a token from a token economy when a client yells in class is a response cost procedure. Option A describes extinction, C describes Differential Reinforcement of Incompatible Behavior (DRI), and D describes escape-maintained reinforcement. While response cost can reduce unwanted behavior, it should always be part of a function-based intervention plan overseen by a BCBA to ensure it is ethical and effective.