Which of the following is not a S.I. base quantity:

Explanation

Option A: Mass (kilogram, kg) is the amount of matter in an object. It is a fundamental property of matter that does not depend on the object's location or motion. Option B: Intensity of light (candela, cd) is the amount of light emitted from a source in a particular direction. It is a measure of the brightness of light. Option C: Velocity is a derived quantity, which means that it can be expressed in terms of the SI base quantities. For example, velocity is equal to the distance traveled divided by the time it takes to travel that distance, so it can be expressed in terms of the base quantities of length and time. Option D: Length (meter, m) is the distance between two points. It is a fundamental property of space that does not depend on the location or motion of the points.