There is decrease in the ownership of the owners by- A. Issue of bonus share B. Redemption of debentures C. Redemption of preference share D. Purchase of building

The correct answer is: C. Redemption of preference share

A preference share is a type of share that gives its holders a preference over ordinary shareholders in the payment of dividends and the return of capital in the event of a liquidation. When a preference share is redeemed, the company buys back the share from the shareholder, which reduces the number of shares outstanding and the ownership of the owners.

The other options are incorrect because:

• Issue of bonus share: This increases the number of shares outstanding, which increases the ownership of the owners.
• Redemption of debentures: This does not affect the ownership of the owners, as debentures are debt instruments, not equity instruments.
• Purchase of building: This does not affect the ownership of the owners, as the building is an asset of the company.

I hope this helps! Let me know if you have any other questions.