With reference to Indian history, who among the following is a future Buddha, yet to come to save the world?

Maitreya is the answer. In Buddhist tradition he is the future Buddha and successor to Gautama, currently living as a bodhisattva in the Tushita heaven. He is expected to descend to earth once the teaching of Gautama Buddha has faded, to restore the Dharma. Maitreya appears in early Buddhist art from Gandhara and Mathura, and his iconography is well documented in Mahayana sculpture.

Why the others are wrong:

• Avalokiteshvara, Lokesvara and Padmapani are different names for the same bodhisattva of compassion, who is already active in Mahayana devotion. Padmapani, the lotus-bearer, is a familiar figure in the Ajanta paintings. None of them is a future Buddha.

Core concept: the Mahayana idea of bodhisattvas and the sequence of Buddhas across time. For Mains, this links to the spread of Mahayana and the Gandhara art tradition under Art and Culture.

Trap: the Mahayana names sound like a list of variants, so candidates pick one because it looks familiar. Remember that the question asks for a Buddha yet to come, and that is Maitreya alone.