What prefix signifies an octal number in Python?

• A. 0x
• B. 0b
• C. 0o
• D. 0d

Answer: (C)

The prefix that signifies an octal number in Python is indeed '0o'. This prefix indicates to Python that the number following it is in octal (base 8) format. Octal numbers include digits ranging from 0 to 7. For example, the octal number '0o10' represents the decimal number 8.

The other prefixes serve different purposes: '0x' is used for hexadecimal numbers (base 16), which include digits ranging from 0 to 9 and letters A to F; '0b' is for binary numbers (base 2), which consist only of 0 and 1; and '0d' is not a standard prefix used in Python for any number system. Understanding these prefixes is crucial for accurately representing numerical data in different bases when programming in Python.