Answer:
The correct answer is - option A.
Step-by-step explanation:
E. L. Thorndlike invented a laboratory device called puzzle box to study the learning behavior especially operant or instrumental conditioning in animals (cats). In this experiments cats are placed individually into the different boxes that can be open by animal by latch like device.
In this experiment the the results of trials by the animal with respect to the time is plotted as graph in where with decrease in the time with succeeding trails.
Thus, the correct answer is - option A.