The correct answer is B. byte.
A byte is a unit of digital information that most commonly consists of eight bits. Eight bits can represent 256 different values, from 0 to 255. Bytes are used to represent characters, numbers, and other data.
A block of characters is a group of characters that are treated as a unit. Blocks of characters are often used to represent words or lines of text.
A word is a unit of data that is larger than a byte. Words are typically 16 or 32 bits long, but they can be longer or shorter. Words are used to represent numbers, addresses, and other data.
A KB is a kilobyte, which is equal to 1024 bytes. KB are often used to measure the size of files or the amount of memory in a computer.
E is not the correct answer because it is not a unit of data.