Who among the following Gandhian followers was a teacher by profession?

The correct answer is J. B. Kriplani. Biographical and general-knowledge sources identify Jivatram Bhagwandas (J. B.) Kriplani as having a background in education and substantial experience as a teacher/educator before devoting himself fully to Congress politics and Gandhian work. The question and standard GK answer keys likewise list Kriplani as the teacher among the given options, distinguishing him from the others (who are better known for legal, political, or administrative careers). Therefore option 3 is the best choice based on the cited reference material and widely accepted biographical summaries.