单选题：One purpose of the buffering technique is used to ____.

One purpose of the buffering technique is used to ____.@[C](1)
A. save memory
B. improve CPU utilization
C. improve I/O device efficiency
D. improve the difference of CPU speed and I/O speed



A.save memory
B.improve CPU utilization
C.improve I/O device efficiency
D.improve the difference of CPU speed and I/O speed


答案：C