In which gallery can you see the Seagram Murals by Mark Rothko?

The Seagram Murals by Mark Rothko can be found at Tate Modern, making it the correct answer. These mural paintings were originally commissioned for the Four Seasons restaurant in New York City but were later donated to the Tate gallery in London. The location is significant as Tate Modern is known for its extensive collection of contemporary art and has played an important role in showcasing Rothko's work in an appropriate context that highlights his contribution to modern art.

The other galleries mentioned do not house the Seagram Murals, as they focus on different collections or periods. The National Gallery primarily exhibits Western European paintings from the 13th to the 19th centuries, while The Courtauld Gallery is better known for its Impressionist and post-Impressionist masterpieces. The Saatchi Gallery focuses on contemporary art, often featuring temporary exhibitions, which do not include the permanent display of Rothko's significant works like the Seagram Murals.