Which Indian leader for the first time used the 'Safety-Valve Theory' to attack the Moderates in the Congress?

Correct answer: (a) Lala Lajpat Rai

Explanation

For the first time, the extremist leader Lala Lajpat Rai, in his book Young India published in 1916, used this theory to accuse the moderate leaders of the Congress of running an organisation which the British rulers were using like a “safety-valve”.