The correct answer is option 'A' - 1963.

Official Language Act:
The Official Language Act was enacted by the Parliament of India in the year 1963. This act aimed to provide for the language to be used for the official purposes of the Union of India, to enable its continued use as an associate official language for certain specified purposes, and to provide for the development of Hindi language for these purposes.

Importance of the Official Language Act:
The Official Language Act holds great significance in the context of India's linguistic diversity and the need for a common language for administrative and official purposes. It aims to strike a balance between promoting the use of Hindi as the official language while respecting the linguistic diversity of the nation.

Key Provisions of the Official Language Act:

1. Hindi as the Official Language:
The act declares Hindi as the official language of the Indian government for all official purposes. It emphasizes the importance of promoting and developing Hindi as the primary language of communication in government offices.

2. Use of English:
The act recognizes the continued use of English for official purposes until a date specified by the President. It allows the use of English alongside Hindi in parliamentary proceedings, state legislatures, and for the purpose of communication between the Union and the states.

3. Transitional Measures:
The act includes transitional provisions to facilitate the gradual transition from English to Hindi as the official language. It provides for the progressive increase in the use of Hindi in official work, along with the training and recruitment of personnel proficient in Hindi.

4. Language Committees:
The act establishes Official Language Committees to review the progress made in the use of Hindi for official purposes and to make recommendations for its further development. These committees play a crucial role in promoting the use of Hindi and ensuring its effective implementation.

Conclusion:
The Official Language Act enacted in 1963 is a crucial legislation that recognizes Hindi as the official language of the Indian government while allowing for the continued use of English. It aims to promote the use of Hindi in official work, preserve linguistic diversity, and ensure effective communication in administrative and official matters.