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At time t = 0, a material is composed of...

At time t = 0, a material is composed of two radioactive atoms A and B, where `N_(A0) = 2N_(B0)`.
The decay constant of both kind of radioactive atoms is `lamda` . However, A disintegrates to B and B disintegrates to C. Which of the following figures represents the evolution of `N_B(t)//N_B(0)` with respect to time t?
[`N_A(0)=`No. of A atoms at t = 0]
[`N_B(0)=` No. of B atoms at t= 0 ]

A

B

C

D

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