Explanation:

- The Reserve Bank of India (RBI) has permitted co-operative banks to issue prepaid payment instruments (PPIs), such as mobile wallets.

- PPIs are financial tools that come preloaded with money and allow users to make transactions.

- Restrictions are typically placed on the amount of money that can be transacted using these instruments.

- Option 1: ?10,000 is a common limit for basic PPIs, appealing for smaller, everyday transactions.

- Option 2: ?15,000, Option 3: ?12,000, Option 4: ?16,000, and Option 5: ?18,000 could signify limits for more advanced PPIs, but may not be relevant for basic co-operative bank instruments.

Correct Answer: Option 1 - ?10,000