Celsius (°C) is the standard unit of Temperature, which is the correct answer. The Celsius scale, also known as centigrade, is widely used globally for everyday measurements and in most scientific contexts. It defines the freezing point of water as 0°C and the boiling point as 100°C at standard atmospheric pressure, providing a convenient and intuitive scale for measuring hotness or coldness.
The other options represent different physical quantities with distinct units. Speed is typically measured in meters per second (m/s) or kilometers per hour (km/h). Volume is measured in cubic meters (m³) or liters (L). Distance is measured in meters (m) or kilometers (km). Celsius is exclusively associated with the measurement of temperature, distinguishing it from these other fundamental units.