Final answer:
Nityanand Swami sent Muktanand Swami to debate against Siddhanand Swami.
Step-by-step explanation:
In the realm of spiritual discourse, it is customary for leaders like Nityanand Swami to delegate representatives for debates, allowing their disciples to engage in intellectual discussions on their behalf. D. Muktanand Swami, being a trusted and knowledgeable figure within Nityanand Swami's following, likely possessed a deep understanding of their spiritual philosophy. Sending a disciple to engage in such debates aligns with the tradition of guru-disciple dynamics, where disciples are entrusted with the responsibility of articulating and defending their spiritual leader's teachings. This practice enables the dissemination of spiritual knowledge while also fostering a sense of collective learning and growth within the community of followers.