An irreversible reaction is one that:
(a) reaches thermodynamic equilibrium long before it has gone to completion
(b) occurs at high pressure and low temperature where the ideal gas law does not apply
(c) causes an inversion in the activity coefficient (d) has an extremely large equilibrium constant
(d) has an extremely large equilibrium constant

(d) has an extremely large equilibrium constant.

Explanation:

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Considering a generic chemical reaction:

The equilibrium constant is defined as:

Now, an irreversible chemical reaction is a reaction in which the reagents are converted into products with no chance of coming back, so, considering the previous chemical reaction, the concentration of both A and B tends to be zero, so an extremely large equilibrium constant is gotten.

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