Final answer:
The ecumenical movement has led to changes within Christianity, particularly in promoting unity among different denominations and influencing the organizational evolution of Christian groups.
Step-by-step explanation:
The ecumenical movement has resulted in changes within Christianity (c). The movement aims at promoting unity among different Christian denominations. It has had a significant impact on how Christian organizations have transitioned through different organizational phases - for example, beginning as a cult, transforming into a sect, and ultimately existing as an ecclesia. While the Delhi Sultanate rulers were followers of Islam, and Buddhism and Hinduism saw their evolutions and spread throughout Asia, it is within Christianity that the ecumenical movement has specifically fostered change by encouraging cooperation and greater unity among various Christian churches and denominations.