Answer:
1) That the mistake did not have a material effect on the agreement.
Step-by-step explanation:
Since it's provided in the question that the Maurice was offering Mike his used computer for $300. After accepting the offer, both thought the machine will be one year old but in fact it is 18 months old And Maurice's best position to enforce this contract is that the contract does not have any material effect on the agreement as the Maurice is not intentionally or deliberately doing it.
Hence, the first option is correct