Answer: D

According to the consulting report of "Global Alternative Investment Survey" by towers watson, a world-renowned consulting organization, BlackRock is the largest commodity management company, with assets under management reaching 74 billion US dollars; Macquarie Group is the largest existing infrastructure investment management company, with assets under management as high as 95 billion US dollars. CB Richard Ellis Global Investment Group is the largest real estate management company; Goldman Sachs is the largest private equity management company with a scale of $68 billion; Bridgewater Investment Company is the largest hedge fund management company with assets of $84 billion.