The correct answer is A. 11 bytes.
A byte is a unit of digital information that most commonly consists of eight bits. A bit is the smallest increment of data on a computer. It can be either a 0 or a 1. Eight bits together form a byte, which can represent 256 different values.
The string “HELLO WORLD” is made up of 11 characters. Each character is represented by a single byte, except for the space character, which is represented by two bytes. Therefore, the string “HELLO WORLD” needs 11 bytes to store.
Option B is incorrect because it assumes that each character in the string is represented by two bytes. This is not the case for all characters. For example, the space character is represented by two bytes, but all other characters are represented by a single byte.
Option C is incorrect because it assumes that each character in the string is represented by a single byte. This is not the case for the space character, which is represented by two bytes.
Option D is incorrect because it assumes that each character in the string is represented by a single bit. This is not the case for any character. Each character is represented by a single byte, except for the space character, which is represented by two bytes.
Option E is incorrect because it is not one of the possible answers.