By spring 1949, the Berlin Airlift proved successful. The Western Allies<span> showed that they could sustain the operation indefinitely. At the same time, the Allied counter-blockade on eastern Germany was causing severe shortages, which, Moscow feared, might lead to political upheaval.</span>
Answer:
operant conditioning.
Explanation:
Operant conditioning is the term given to a learning method, where an individual is trained to exhibit specific behavior after an element is presented to him. When this individual exhibits the required behavior, he receives a reward, otherwise he receives a punishment.
In the example given in the question above, the cat Charlie underwent an operative conditioning process, as it was trained to be in the kitchen whenever it heard the noise of the electric can opener. When Charlie answered that noise, it got a food that it liked. For this reason, whenever it hears the noise, it goes to the kitchen waiting for the reward.
B or d because you would want to know how much and the other prices
