R.V. Dhulekar was prophesising which language to be made national language?

Hindi

The correct answer is Option (1) → Hindi

R.V. Dhulekar was a strong proponent of Hindi as the national language of India. He advocated for the promotion and adoption of Hindi as the common language that could be used for communication across the diverse linguistic regions of the country. This was part of the broader debate and discussions regarding the choice of a national language in India during the post-independence period.

Ultimately, Hindi, written in the Devanagari script, was adopted as one of the official languages of India, as enshrined in the Indian Constitution. However, English was also retained as an associate official language to ensure continued communication and governance in English until Hindi could be adopted more widely. The choice of the national language was a significant aspect of post-independence India's language policies and continues to be a topic of discussion and debate in the country.

So, the correct option is [1].