Using Meta-Analysis to Analyze the Results of Several Studies That

Using meta-analysis to analyze the results of several studies that used the ganzfeld procedure to test clairvoyance, what general results have researchers found?

A) One summary of dozens of ganzfeld studies showed a hit rate well above chance level, but other psychologists dispute the statistical techniques used.
B) The meta-analysis conclusively showed that the ganzfeld studies do NOT demonstrate evidence for the existence of an ESP effect.
C) The meta-analysis conclusively showed that the ganzfeld studies DO reliably demonstrate evidence for the existence of psychokinesis but not for clairvoyance.
D) The meta-analysis showed that sensory adaptation can account for many so-called ESP demonstrations.