In a meta-analysis of 33 randomized-controlled trials of the treatment of specific phobias, Wolitzky-Taylor et al. (2008)concluded that exposure-based treatments:

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Wolitzky-Taylor et al. (2008) meta-analysis found that exposure-based treatments produced large effect sizes compared to no treatment and outperformed both placebo conditions and other psychotherapeutic treatments. Therefore, options A and B are correct. The study did not find evidence suggesting that exposure-based treatments were more effective when combined with another psychotherapeutic approach, so option C is incorrect.

In a Meta-Analysis of 33 Randomized-Controlled Trials of the Treatment