The correct answer is B. ROM.
ROM stands for Read-Only Memory. It is a type of memory that is used to store permanent data, such as the BIOS. The BIOS is a program that is used to initialize the hardware and load the operating system when the computer is turned on. It is stored in ROM so that it can be accessed even if the power is turned off.
RAM stands for Random Access Memory. It is a type of memory that is used to store temporary data, such as the operating system and applications that are currently being used. RAM is volatile, which means that it loses its contents when the power is turned off.
The CPU is the Central Processing Unit. It is the main processor in the computer and is responsible for carrying out instructions. The CPU does not store data, but it does access data that is stored in RAM and ROM.
The hard drive is a storage device that is used to store permanent data, such as files, programs, and operating systems. The hard drive is not directly involved in the boot process, but it is used to store the BIOS and operating system.
I hope this helps!