The correct option is C undisputed
Undisputed means not disputed or called in question; accepted. Vinayak's authority is never questioned. Hence, Option A is correct. Among the rest of the options solely means not involving anyone or anything else, strongest means having the power to move heavy weights or perform other physically demanding tasks, full means containing or holding as much or as many as possible; having no empty space, controversial means giving rise or likely to give rise to controversy or public disagreement. These do not express this meaning, hence incorrect.