Who among the following held the Office of Speaker in Central Legislative Assembly of British era and the Parliament of
Let me explain it simply. The question is asking about who among the following held the Office, and the answer is G.V. Mavlankar. In Constituent Assembly (1946), G.V. Mavlankar is the name you will see again and again for this topic. Read it twice, say it once, and it will stick.
Ref: [Mizoram PSC (Pre) 2018 MPPCS (Pre) 2010] | Bipan Chandra, India's Struggle for Independence, and NCERT History textbooks discuss Constituent Assembly (1946) and explain the events, leaders and movements that support the correct answer for this question.