Final answer:
The correct MC Computer Hierarchies for Speed are Registers, Cache, Main Memory, and Secondary Storage, in that order from fastest to slowest. This order reflects how quickly the CPU can access data from each type of memory.
Step-by-step explanation:
The question "What are the MC Computer Hierarchies for Speed?" refers to the order of storage devices in a computer system based on their speed. The correct order from fastest to slowest is: Registers, Cache, Main Memory, and finally Secondary Storage. Therefore, the correct answer is A. Register, Cache, Main Memory, Secondary Storage.
Registers are the fastest type of memory because they are located inside the CPU and have the quickest access time. Next is the cache memory which is slightly slower but also very quick, designed to speed up the access to frequently used data and instructions. Main memory, or RAM (Random Access Memory), is slower than cache but faster than secondary storage. Lastly, secondary storage such as hard drives or SSDs is the slowest form of memory in this hierarchy.