Answer:
a. Rudo's act was unenforceable for lack of consideration
Step-by-step explanation:
In this scenario where Rudo changed the contract after Harun had commenced painting, his new contract is not enforceable because it lacks consideration.
Consideration is defined as the action in a contract where the parties involved agree to carry out their side of the contract.
When the parties do not agree to the terms of the contract then the contract is not legally binding on the parties.
Rudo made the first contract which Harun agreed to. However Harun did not agree to the terms of the modified contract, so this makes it unenforceable