This question explores the conditions under which a purchaser is considered a 'deemed tenant' rather than a full owner. The correct answer is 'Pays full money with interest'.
Pays full money with interest (B) is accurate because a purchaser is typically deemed a tenant until all financial obligations, including the principal amount and any accrued interest, are completely settled. This ensures the seller's financial security before full ownership is transferred.
Builds house (A) and Cultivates once (C) are irrelevant to the financial completion of the purchase agreement.
Collector issues certificate (D) might be a subsequent administrative step, but it is not the primary condition that ceases the 'deemed tenant' status, which is fundamentally tied to financial fulfillment.