Final answer:
Calculus is the branch of mathematics that deals with change. The derivative represents the rate at which a function is changing at a particular point.
Step-by-step explanation:
is the branch of mathematics that deals with change. It includes the study of limits, derivatives, integrals, and infinite series. The derivative represents the rate at which a function is changing at a particular point. It measures the slope of the tangent line to the graph of the function at that point. Therefore, the correct answer to the question is (A) Derivative.