The correct answer is option 'B', Part XVII of the Constitution of India deals with the official language.

Official Language provisions in the Constitution of India:

1. Historical Background:
The issue of the official language in India was a contentious one during the framing of the Constitution. There were debates and discussions on whether Hindi should be the sole official language or if there should be provisions for the use of other languages as well.

2. Adoption of Hindi and English:
Ultimately, the Constitution of India, in Part XVII, recognized both Hindi and English as the official languages of the Union. English was to continue to be used for official purposes until a date specified by the President, and Hindi was to be progressively expanded to fulfill the role of the official language.

3. Official Language Commission:
To promote the use of Hindi, the Constitution also established the Official Language Commission, which was tasked with making recommendations regarding the progressive use of Hindi as the official language and to secure its enrichment.

4. Implementation of Hindi:
Under Part XVII, the President was given the authority to issue directives regarding the use of Hindi for official purposes. These directives were aimed at ensuring the gradual increase in the use of Hindi in various aspects of governance.

5. Official Language of the States:
While Hindi and English were recognized as the official languages of the Union, each state in India was given the freedom to adopt its own official language(s) for its own purposes. This provision aimed to respect the linguistic diversity of the country.

6. Language of the Judiciary:
Part XVII also addresses the language to be used in the High Courts and the Supreme Court. It states that the proceedings in the Supreme Court should be conducted in English, while the High Courts have the choice to use English or the respective official language of the state.

7. Promotion and Protection of Languages:
The Constitution of India, under Part XVII, also includes provisions for the promotion and protection of languages. It states that the Union and the states should endeavor to promote the welfare of the people by protecting and developing the languages used by various sections of the population.

In conclusion, Part XVII of the Constitution of India deals with the official language, recognizing both Hindi and English as the official languages of the Union. It also provides for the promotion and protection of languages and allows states to adopt their own official languages.