In Thorndike's Research Involving Cats in Puzzle Boxes,when Did the Puzzle

Multiple Choice

In Thorndike's research involving cats in puzzle boxes,when did the puzzle box open,allowing the cat freedom and food?

A) after a fixed period of time that the cat had been inside the box
B) after escape attempts had been extinguished
C) when the cat engaged in a behaviour that moved a concealed lever
D) 500 milliseconds after a buzzer sounded