Answer:
The correct answer is - option D. in equilibrium, there will be approximately 40 x particles in A and 40 x particles in B, and those numbers will fluctuate but will remain near 40.
Step-by-step explanation:
Equilibrium is the condition where all the condition is where all the factors or influence forces are balanced in a particular system. The perfect balanced condition is not easy to get or can not remain constant for long.
In this example, both A and B get 40 x particles to be in equilibrium however fluctuation persists but still approx 40 remains.
Thus, the correct answer is - option D