Gateway of India:

The correct answer is option 'D', the Gateway of India.

Introduction:
The Gateway of India is an iconic monument located in Mumbai (formerly known as Bombay), Maharashtra, India. It was built as a grand ceremonial entrance to the city, and it holds great historical significance.

Commemorating the visit of King George V and Queen Mary:
The Gateway of India was built to commemorate the visit of King George V and Queen Mary to Bombay (now Mumbai) in 1911. The British government wanted to build a significant monument to honor the royal couple's visit and to mark the importance of Bombay as a major port city.

Architectural Design:
The monument was designed by the architect George Wittet in the Indo-Saracenic style, which combines elements of Indian, Islamic, and Western architecture. The construction of the Gateway of India started in 1913 and was completed in 1924. It stands at a height of 26 meters (85 feet) and is made of yellow basalt and reinforced concrete.

Symbol of British Raj:
During the British Raj, the Gateway of India served as a symbol of colonial power and authority. It was the first structure that visitors arriving by sea would see, symbolizing the grandeur and dominance of the British Empire.

Historical Significance:
Apart from its connection to the royal visit, the Gateway of India also witnessed significant historical events. It served as the ceremonial entrance for numerous viceroys, governors, and other important personalities during the British era. It was also the departure point for the last British troops leaving India after independence in 1947.

Tourist Attraction:
Today, the Gateway of India is a major tourist attraction in Mumbai. It is visited by thousands of tourists every day who come to admire its architectural beauty, take photographs, and enjoy the stunning views of the Arabian Sea. It has become an iconic landmark and a symbol of Mumbai's rich history and heritage.

In conclusion, the Gateway of India was built to commemorate the visit of King George V and Queen Mary to Bombay. It stands as a testament to the historical significance of the city and continues to be a prominent symbol of Mumbai's cultural heritage.