彩色显示器的颜色是由红（R）、绿（G）、蓝（B）三种基色合成而得到的。假定表示R、G、B三中基色的二进制位数都是8位，则可显示的颜色数有多少种？

A．1024

B．16384

C．65536

D．16777216

For each person it is certified to carry，a lifeboat on an oceangoing passenger vessel must be provided with all of the following EXCEPT（）.

A.3 litres of water

B.1 unit of provisions

C.1 seasickness kit

D.1 life preserver