Concept:A right issue is the offer of new shares to existing shareholders at a special lower price.Explanation:In a right issue, the company gives existing shareholders the chance to buy additional shares in proportion to their current holdings.These shares are offered at a preferential rate, meaning a price below the normal market price.This right is often transferable, so a shareholder may sell it to someone else if they do not want to buy more shares.The bonus issue gives free shares, while private placing and issue by introduction are not limited to existing shareholders at a preferential rate.Answer:A. a right issue