(D) Odia
Odia is included in the Eighth Schedule of the Indian Constitution as one of the 22 Scheduled Languages. Hariyanavi, Rajasthani, and Garhwali are not scheduled languages.
Source: How is federalism practised?, Chapter 2
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The passage explicitly lists all 22 Scheduled Languages in a table, and Odia (3.10% speakers) appears in it. Rajasthani is mentioned as being grouped under Hindi, not as a separate scheduled language. Hariyanavi and Garhwali do not appear at all. Examiners expect students to recall that there are 22 Scheduled Languages in the Eighth Schedule and identify the correct one from the options.