In this article, the author tries to interpret the function of______.

A．forgetfulness is a response to learning
B．the memory storage system is an exactly balanced input-output system
C．memory is a compensation for forgetting
D．the capacity of a memory storage system is limited because forgetting occurs

A．Driving can show his real self.
B．Driving can show the other part of his personality
C．Driving can bring out his character.
D．His car embodies his temper.