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The correct answer is option 1: Vithalbhai J Patel. Vithalbhai J Patel was the first non-official member to be elected as Speaker of the Central Legislative Assembly on 24-8-1925.
Option 2, Muhammad Yakub, is incorrect as he was not the first non-official member to be elected as Speaker of the Central Legislative Assembly.
Option 3, G. V. Mavalankar, is incorrect as he is known for being the first Speaker of the Lok Sabha (Lower House of the Parliament of India) after the independence of India in 1947. He was not the first non-official member to be elected as Speaker of the Central Legislative Assembly.
Option 4, Sardar Hukum Singh, is incorrect as there is no record of him being elected as the Speaker of the Central Legislative Assembly.
In conclusion, the correct answer is option 1, Vithalbhai J Patel.