The correct option is C). Void contract. It is void type of contract if you sign a contract to purchase a machine that will allow you to travel back in time and meet Abraham Lincoln.
Void contract is a formal contract between two parties, which is not authorized by the law and enforceable from the moment it was created.
A void contract is little differ from the valid contract. Void contract is not an actual contract, despite it is unenforceable.
Both void and voidable contract are null, but a void contract cannot be officially valid.
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