Final answer:
A group of eight bits is called a byte. It is used to represent a character or a number in most modern computer systems.
Step-by-step explanation:
The correct answer is B. Byte.
A group of eight bits is called a byte. A bit is the smallest unit of data in computing and can have two values, 0 or 1, representing the binary system of 0s and 1s. A byte, on the other hand, consists of eight bits and is used to represent a character or a number in most modern computer systems.
For example, the ASCII (American Standard Code for Information Interchange) encoding system uses one byte to represent a single character, allowing for a total of 256 different characters to be represented.