Concept:A consortium is an association of independent companies that pool resources for a project too large for any one firm to handle alone.Explanation:A subsidiary is a company owned or controlled by a parent company, so it is not correct.A merger happens when two or more companies combine into a single new entity.An acquisition occurs when one company purchases another company.A consortium is formed when several independent companies join together specifically to undertake an activity that lies beyond the ability of any single company.Hence, the correct answer is consortium.Answer:C. a consortium