In the given question, a statement of Assertion is followed by a statement of Reason. Mark the correct answer.

Assertion: Language Committee of the Constituent Assembly decided, but not formally declared, that Hindi in the Devanagari script would be the official language of India.
Reason: The transition to Hindi would be gradual. For the first five years, English would continue to be used for all official purposes.

The Assertion is correct but the Reason is incorrect.

The correct answer is Option 4- The Assertion is correct but the Reason is incorrect.

Assertion: Language Committee of the Constituent Assembly decided, but not formally declared, that Hindi in the Devanagari script would be the official language of India.
Reason: The transition to Hindi would be gradual. For the first five years, English would continue to be used for all official purposes. 

The reason is incorrect as it was decided that for the first FIFTEEN years, English would continue to be used for all official purposes. 

On 13 September 1949, Dhulekar’s speech on the language of the nation once again sparked off a huge storm. By now the Language Committee of the Constituent Assembly had produced its report and had thought of a compromise formula to resolve the deadlock between those who advocated Hindi as the national language and those who opposed it. It had decided, but not yet formally declared, that Hindi in the Devanagari script would be the official language, but the transition to Hindi would be gradual. For the first fifteen years, English would continue to be used for all official purposes. Each province was to be allowed to choose one of the regional languages for official work within the province. By referring to Hindi as the official rather that the national language, the Language Committee of the Constituent Assembly hoped to placate ruffled emotions and arrive at a solution that would be acceptable to all.