It's D because a checklist is to help you organize a list of things like groceries, homework etc. It can sperate indormation..for example, homework need to be separated so we won't messed up on which is which. It can also portray information clearly because you're making a check list.
A microprocessor can directly process machine code but most programmers almost never write in it.
C. Machine code
TrueBones do not change position