The Gateway of India, built in the traditional Gujarati style was constructed to welcome which of the following Kings and Queen in India?

King George V and Queen Mary

The correct answer is Option 3 - King George V and Queen Mary

Towards the beginning of the twentieth century, a new hybrid architectural style developed which combined the Indian with the European. This was called Indo-Saracenic.
'Indo' was shorthand for Hindu and 'Saracen' was a term Europeans used to designate Muslim. The inspiration for this style was medieval buildings in India, with domes, chhatris, jalis, and arches.
By integrating Indian and European styles in public architecture the British wanted to prove that they were legitimate rulers of India.
The Gateway of India, built in the traditional Gujarati style to welcome King George V and Queen Mary to India in 1911, is the most famous example of this style.
The industrialist Jamsetji Tata Built the Taj Mahal Hotel in a similar style. Besides being a symbol of Indian enterprise, the building became a challenge to the racially exclusive clubs and hotels maintained by the British.