Ordinarily, a minor's agreement is

Option A contains a typo - it should read 'void ab initio' (void from the beginning), not 'voidable initio'. The law is clear that a minor's agreement is void ab initio - it was never valid from the outset and cannot be enforced by either party. This is a fundamental protection for minors. 'Voidable' means initially valid but can be avoided, which is incorrect for minors. 'Valid' is clearly wrong as minors lack capacity. 'Unlawful' refers to illegality, not capacity issues. Despite the typo in option A, the intended answer is clearly the void ab initio doctrine.