Which is an example of an assembly item?

Which is an example of an assembly item?

A.
A personal computer complete with keyboard, monitor, and mouse. The customer can upgrade
different components such as the CPU, if necessary.

B.
An emergency supply carrying case, which comes complete with bandages, medicine, an icepack, and gauze. The case is completely packaged together and no items can be substituted.

C.
A woman’s blouse that comes in two different collar styles, three different colors, and sizes of
Petite, Small, Medium, and Large.

D.
A beverage that is sold by the case, half-case, or per bottle.