The correct answer is Option 3 - He took moral responsibility for a railway accident.
Lal Bahadur Shastri had resigned from the position of Railway Minister accepting moral responsibility for a railway accident.
Lal Bahadur Shastri, hailing from Uttar Pradesh, emerged as a non-controversial leader who had served as a Minister in Nehru's cabinet for an extended period. Nehru had grown reliant on him, particularly in his final year. Shastri's reputation was grounded in his simplicity and unwavering commitment to principles. Prior to this, he had tendered his resignation as the Railway Minister, accepting moral responsibility for a significant railway accident. | 
