The correct answer is (d). The United States of America has provided funds for the conservation of Ajanta-Ellora caves.
Ajanta and Ellora are two groups of rock-cut caves located in the Aurangabad district of Maharashtra, India. The caves are famous for their Buddhist, Hindu and Jain cave temples and monasteries, which date from the 2nd century BCE to the 10th century CE. The caves are a UNESCO World Heritage Site.
The United States has provided funding for the conservation of Ajanta-Ellora caves through the United States Agency for International Development (USAID). USAID has provided over $1 million for the conservation of the caves since 1992. The funding has been used to support a variety of conservation activities, including the stabilization of the caves, the removal of invasive vegetation, and the conservation of the paintings and sculptures.
The other options are incorrect. China, Japan, and Germany have not provided funding for the conservation of Ajanta-Ellora caves.