The correct answer is D.

In a private placement, a company sells securities to a select group of investors (typically institutional or high-net-worth investors) rather than to the public. This method allows ABC Company Limited to have more control over who buys its shares and to reduce public disclosure, thus preserving its competitive advantage. The uncertainty over the share price could also be mitigated through private negotiations with the selected investors.

A is incorrect. In this scenario, an investment bank would make its best effort to sell the securities to the public, but there is no guarantee of sale for all the shares. Moreover, the company's desire to limit disclosure and maintain control over ownership is not compatible with a public offering.

B is incorrect. A rights issue involves offering new shares to existing shareholders, usually at a discount. However, as a private company, ABC Company Limited might not have a broad shareholder base to raise the needed capital.

C is incorrect. In this case, an investment bank would buy all the shares and resell them to the public. While this would ensure raising the needed funds, it would involve wide public disclosure and does not allow the company to control its ownership distribution.