Explanation:

- The scenario is: Y tells the shopkeeper, "let him (X) have the goods, I will see you paid."

- Option 1: Guarantee – This is when one person promises to a creditor to pay the debt or perform the duty if the principal debtor defaults. Y’s statement fits this perfectly. (Correct Answer)

- Option 2: Bailment – This is the delivery of goods by one person to another for a specific purpose, to be returned after the purpose is over. Not relevant here.

- Option 3: Indemnity – Involves one party agreeing to compensate another for a loss. Here, there is no such promise of compensation for loss.

- Option 4: Pledge – This means delivering goods as security for payment of a debt or performance of a promise. Not the case here.