The question asks how the Indian Contract Act, 1872 treats a contract by an Indian citizen to supply medicines to a citizen of a country India has declared an enemy in a war, even where a neutral intermediary and bank are used. Testing each option against Section 23's public policy rule resolves this.
- Void, trading with an enemy in war is prohibited and against public policy: Section 23 of the Act voids any agreement whose object or consideration is opposed to public policy. Contracts with citizens of an enemy nation during a declared war are treated as against public policy because they could aid or benefit the enemy state, regardless of the intermediary structure used, which makes the contract void from the outset.
- Valid unless the Government expressly cancels: This treats the contract as presumptively valid and needing an affirmative government act to undo it, which reverses the actual position. A contract that is void for being against public policy does not need to be cancelled by anyone; it never had legal effect to begin with.
- Voidable, only the Government of India can cancel: A voidable contract is one that remains valid until the party with the right to avoid it chooses to do so. Trading with the enemy contracts are not left standing until someone elects to void them, they are void ab initio, so describing this as merely voidable understates the legal consequence.
- Valid, goods are humanitarian and payment is via a neutral country: The humanitarian nature of medicines and the use of a neutral intermediary and bank do not cure the underlying illegality of the transaction; the object of the contract still involves commerce with a citizen of the enemy state during war, which remains against public policy regardless of these mitigating features.
Since the object of the contract is trade with an enemy national during a declared war, Section 23 renders it void outright, not merely voidable, valid pending cancellation, or excused by the goods being humanitarian.
Therefore, the correct answer is Void, trading with an enemy in war is prohibited and is against public policy.