At time $t=0$, a material is composed of two radioactive atoms $A$ and $B$, where $N_A\left(0\right)=2N_B\left(0\right)$ The decay constant of both kind of radioactive atoms is $\lambda$. However, $A$ disintegrates to $B$ and $B$ disintegrates to $C$. Which of the following figures represents the evolution of $\frac{N_B\left(t\right)}{N_B\left(0\right)}$ with respect to time $t$?

• A

  
• B

  
• Correct answer
  C

  
• D

  

Hence, the correct answer is option: 'C'.