Regarding Early ESP Experiments, Which of the Following Statements Is/are

Multiple Choice

Regarding early ESP experiments, which of the following statements is/are TRUE?

A) Early experimenters sometimes unconsciously gave subjects cues about the Zener cards with their eyes, facial gestures, or lip movements.
B) The more closely psi experiments are examined, the more likely it is that claimed successes will not be sustained.
C) A successful psi experiment is most likely not repeatable.
D) All of these statements are true.