The statement that is true here is:
b.
The agreement is unenforceable under the doctrine of impossibility.
Step-by-step explanation:
This is a murky situation in terms of the law because the law itself changes after the contract is drawn up.
We can see how in a situation like this the old rule could still apply however that cannot be the case here as the permit to draw up the land simply cannot pass government sanction anymore.
If the act was possible it would only be if it was to be done in Independence.
Now that a specific law outlaws it, the work becomes impossible and the contract is not valid anymore.