Step 1: Conceptualization:
The inquiry seeks to identify concepts that align with Mahatma Gandhi's developmental framework for India, characterized by decentralization, self-reliance, and the empowerment of the most vulnerable.
Step 3: Elaboration:
\[\begin{array}{rl} \bullet & \text{(B) Sarvodaya: Coined by Gandhi, this term signifies 'welfare of all' and encapsulates his fundamental political and social doctrine of societal upliftment for every individual.} \\ \bullet & \text{(A) Antyodaya: A direct application of Sarvodaya, meaning the 'upliftment of the last person' or the most disadvantaged. Gandhi posited that development initiatives should be evaluated based on their impact on the poorest segment of society.} \\ \bullet & \text{(C) Panchayati Raj: This concept of decentralized governance via village councils (Gram Swaraj, or village self-rule) was integral to Gandhi's vision of a people-centric polity at the village level.} \\ \bullet & \text{(D) Reverse migration: While Gandhi championed strengthening villages to mitigate distress migration, 'reverse migration' as a specific policy term is a contemporary construct, unlike core Gandhian tenets. His emphasis was on achieving village self-sufficiency to render migration unnecessary.} \\ \end{array}\]Consequently, Sarvodaya, Antyodaya, and Panchayati Raj are the concepts most intrinsically linked to Gandhian principles of national development.
Step 4: Conclusion:
The concepts pertinent to Gandhi's integrated development approach are (A) Antyodaya, (B) Sarvodaya, and (C) Panchayati Raj.