Assertion (A) : For a first order, the concentration of a reaction decreases exponentially with time.
Reason (R ): The rate of reaction at any time depends upon the concentration of the reactant at that time.
A. If both `(A)` and `(R )` are correct, and `(R )` is the correct explnation of `(A)`.
B. If both `(A)` and `(R )` are correct, but `(R )` is noth the correct explanation of `(A)`.
C. If `(A)` is correct, but `(R )` is incorrect.
D. If `(A)` is incorrect, but `(R )` is correct.
