Thorndike's law of effect states that responses to stimuli that are followed by a satisfier tend to be?

According to the article Psychics and Scientists, psychic Jeanne Dixon correctly predicted

(a) that John F. Kennedy would be assassinated (b) that John F. Kennedy would die in his second term as president (c) her own death (d) none of the foregoing [a, b, or c] were accurately predicted by her

____ is when preoperational children understand that objects can be simultaneously part of more than one "class" or group

a. Egocentrism b. Conservation c. Reversibility d. Classification