Following is a qualitative plot that can represent kinetic data obtained with a reactant R where $$[\text{R}]_0$$ and $$[\text{R}]$$ represent the concentrations of R at $$t = 0$$ and $$t = t$$ respectively. 'Y' and 'X' are suitable parameters on the x- and y- axes. The correct representation of the curve is

A

(a)

B

(b)

C

(c)

D

(d)