The correct answer is A. Postage on mailing of Share Certificates.
Expenditure of a capital nature is an expenditure that is incurred in the acquisition of an asset that will be used for the production of income over a period of time. The expenditure on postage on mailing of Share Certificates is an expenditure that is incurred in the acquisition of an asset, which is the Share Certificates. The Share Certificates will be used for the production of income over a period of time, as they represent ownership of a share in the company.
The other options are not of capital nature.
Option B, Payment of Underwriting Commission on issue of Shares, is an expenditure that is incurred in the issue of shares. The issue of shares is a financial transaction, and the expenditure is not incurred in the acquisition of an asset.
Option C, Bank charges for payment of dividend warrants, is an expenditure that is incurred in the payment of dividends. The payment of dividends is a financial transaction, and the expenditure is not incurred in the acquisition of an asset.
Option D, Expenses on printing of Annual Report, is an expenditure that is incurred in the preparation of the annual report. The preparation of the annual report is a non-financial transaction, and the expenditure is not incurred in the acquisition of an asset.