Which red sandstone fort complex in Delhi, shown in this photograph, served as the main residence of Mughal emperors for nearly 200 years and is where the Prime Minister hoists the national flag each Independence Day?

• A Agra Fort
• B Red Fort ✓
• C Amber Fort
• D Gwalior Fort

The Red Fort (Lal Qila) in Delhi was built by Shah Jahan in 1648 and is the site of the Prime Minister's annual Independence Day address.