有几个主人拥有过它?one of the most famous buildings in the united states

有几个主人拥有过它?one of the most famous buildings in the united states
Carnegie Hall
One of the most famous buildings in the United States is Carnegie Hall,the home of classical and popular music concerts in New York.Carnegie Hall is known not just for its beauty and history.But also for its amazing sound.It has been said that the hall itself is an instrument.It takes the music and makes it larger than life.
Carnegie Hall is named after Andrew Carnegie,who paid for its construction.He was a wealthy man who also gave a lot of money to schools and public libraries.Construction on Carnegie Hall began in 1890 and the official opening night was on May 5,1891.
The hall was owned by the Carnegie family until 1924 when it was sold to Robert E.Simon.The building became very old and in 1960,the new owner made plans to destroy it and build an office block.Isaac Stern led a group of people who fought to save Carnegie Hall and finally,the city of New York bought it for $5 million.It was then fixed up between 1983 and 1995.
In 1986,people realized that Carnegie Hall had never kept proper records of its history.
Advertisements and stories in newspapers about how Carnegie Hall needed help to recover its history led people to send in old concert programmers and information from all over the world .Over 12,000 concert programmers were received and with these it was possible to make a proper record of Carnegie Hall’s concert history.
Carnegie Hall is actually made up of several different halls,but the Main Hall,now called the Isaac Stern Hall,is the most famous.Most of the greatest performers of classical music since the time the hall was built have performed in the Main Hall,and its reception areas are decorated with signed photographs of these musicians.The hall itself can hold an audience of 2,804 in five levels of seating.Visitors to the top level have to climb up 105 steps to get there!
Because the best and most famous musicians of all time have played at Carnegie Hall,it is the dream of most musicians who want to be great to play there.This has led to a very old joke which is now part of Carnegie Hall’s history.Question :“How do I get to Carnegie Hall?” Answer:“Practise,practice,practice.”
How many different owners have owned the Carnegie Hall ever since?A.3 B.4 C.5 D.6
我选择A,有：Andrew Carnegie,Robert E.Simon和the city of New York.但是答案是B,说有4个.我怎么想也找不到4个,答案是不是把那个Isaac Stern算进去了?但我认为这个不能算,首先文章没有说Isaac Stern买了它,而且文中有一句话是“The hall was owned by the Carnegie family until 1924 when it was sold to Robert E.Simon”说明期间没有人插手,以及“ finally,the city of New York bought it for $5 million”也说明这一点.另外,文中说“其中现在最著名的是Isaac Stern Hall”不能成为他是主人的理由,可能是因为他“led a group of people who fought to save Carnegie Hall”或是其它很多因素,这只是个命名.
感谢这两位的回答，但问题比较大：
20707311这位热心人，the city of New York我已经算进去了，也只有3个。你看一下我的最后一段问题说明，我很明确地指出有Andrew Carnegie，Robert E.Simon和the city of New York这三个。
第二位，是这样的，我认为这个“the new owner”指的是Robert E.Simon，否则就不是用“the”而是“a”了
麻烦再回答一下