Refer to Exhibit 5-1. Which of the hypotheses violated the criterion that: hypotheses must be testable
a. Peter is an inherently bad boy who had stepped out of line and ran to the classroom by the back stairs in order to infuriate the teacher.
b. Peter leapt from the ground directly into the classroom window.
c. Peter has an identical twin whom the teacher did not know about. He and Peter arranged with the principal to stage the fire drill so that they could play this trick on the teacher.
d. Peter slipped into the boy's room on the way out and returned to his seat from there.
A
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