The question appears incomplete. It gives the reaction $\mathrm{H}_2(g)+\mathrm{I}_2(g) \rightleftharpoons 2\mathrm{HI}(g)$ and asks:

“Attainment of equilibrium is predicted correctly by :”

but the actual option statements A, B, C, D are missing.

Without the contents of the options, it is impossible to evaluate which statement is correct.

What can still be said about the reaction

For the reaction $\mathrm{H}_2(g)+\mathrm{I}_2(g) \rightleftharpoons 2\mathrm{HI}(g)$

the total number of moles of gas does not change: $\Delta n = 2-(1+1)=0$ So, at constant temperature:

• change in pressure or volume does not shift equilibrium,
• equilibrium is attained when the reaction quotient equals the equilibrium constant,
• and at equilibrium the forward and backward reaction rates become equal.

However, since the option texts are not provided, I cannot determine whether option C corresponds to any of these correct statements.

Conclusion

Because the options are blank, the answer cannot be verified from the given information alone.