R.V. Dhulekar was a strong advocate for the adoption of Hindi as the national language during the debates in the Constituent Assembly of India. He actively participated in discussions and expressed his views in favor of promoting Hindi as the official language, emphasizing its role in fostering national unity and communication across the diverse linguistic landscape of the country. Dhulekar's contributions and arguments played a role in shaping the language policy decisions during the framing of the Indian Constitution.

So, the correct option is [2].