Concept:
After the Revolt of 1857, the British Government reorganized the administration of India through an important constitutional act.
Step 1:
The Revolt of 1857 exposed weaknesses in the administration of the East India Company.
Step 2:
To improve administration and establish direct British Crown control over India, the Government of India Act of 1858 was enacted.
Step 3:
The Act transferred power from the East India Company to the British Crown and aimed to provide better governance.
Step 4:
• Indian Councils Act 1861 expanded legislative councils.
• Government of India Act 1919 introduced dyarchy.
• Government of India Act 1935 introduced provincial autonomy.
Step 5:
Therefore, the correct answer is Government of India Act of 1858.
\[
\boxed{\text{(4) Government of India Act of 1858}}
\]