Correct Answer:
C. 10 Downing Street
Explanation:
10 Downing Street (colloquially known as 'Number 10') in London is the official residence and executive office of the Prime Minister of the United Kingdom. It has served this purpose since 1735, making it one of the most famous political addresses in the world.
### Important Facts:
- Location: City of Westminster, London.
- Official Title: The PM resides there in their capacity as the First Lord of the Treasury.
- Chief Mouser: The residence features an official resident cat known as the 'Chief Mouser to the Cabinet Office' (currently Larry the cat).