In a graph of the results from an ABAB reversal design,which of the following features justifies a conclusion that the treatment causes changes in behavior?

Question

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The best justification for a conclusion that the treatment causes changes in behavior is repeatedly demonstrating consistent changes in behavior when the treatment is introduced, withdrawn, and introduced again. This demonstrates that the changes in behavior are directly related to the presence or absence of the treatment rather than other factors. The other options (A, B, and C) may provide some evidence of the treatment's effect, but they do not fully support a conclusion that the treatment causes changes in behavior. A large change in behavior when treatment is first introduced could be due to novelty effects or other factors, the time delay between introduction and behavior change may be due to individual differences, and a permanent change in behavior may result from some other aspect of the experimental design.

In a Graph of the Results from an ABAB Reversal