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'10 Downing Street' is the official abode and the office of the first Lord of the Treasury and hence the Prime Minister of the United Kingdom. The headquarters of Her Majesty's Government, it is situated on Downing Street in the City of Westminster, in London. Number 10 is perhaps the most famous address in the United Kingdom and one of the most widely recognised houses in the world. Almost three hundred years old, the building contains about one hundred rooms.
There is a private residence on the third floor and a kitchen in the basement. The other floors contain offices and numerous conference, reception, sitting and dining rooms where the Prime Minister works and meets with and entertains government ministers, national leaders and foreign dignitaries. There is an interior courtyard and behind, a terrace overlooking a half acre garden. Adjacent to St. James Park, Number 10 is near the Palace of Westminster, the Houses of Parliament, and the Buckingham Palace, the official London residence of the British Monarch.
Originally Number 10 consisted of three houses that were offered to Robert Walpole as he was given the office of first Lord of Treasury. There after Walpole commissioned William Kent to join the three houses together. It is this larger house that is today
known as 'Number 10 Downing Street. The arrangement was not an immediate success. Despite its size and convenient location near Parliament, only a few early Prime Ministers lived there. Costly to maintain, neglected, and run-down, Number 10 was close to being razed several times. Nevertheless, Number 10 survived and became linked with many statesmen and events in British history. In 1985, Prime Minister Margaret Thatcher said Number 10 had become "one of the most precious jewels in the national heritage".
What is '10 Downing Street'?

AThe official residence of the first lord of Treasury in the United Kingdom.
BThe official residence of the Prime Minister of the United Kingdom.
CThe headquarters of Her Majesty's Government.
DAll of these.