By which of the following acts was a bicameral legislature introduced in India at the centre level?

Correct option is C

The correct answer is (c) Government of India Act of 1919.
 The Government of India Act of 1919, also known as the Montagu-Chelmsford Reforms, introduced a bicameral legislature at the central level in India. This act established the Central Legislative Assembly (lower house) and the Council of States (upper house).
 This was a significant step in the constitutional development of India, aiming to involve more Indians in governance and laying the foundation for a more representative form of government.
Information Booster:
 Indian Councils Act of 1861: Introduced limited Indian representation in the legislative councils, but it did not establish a bicameral legislature.
 Regulating Act of 1773: Was the first step towards centralizing administration in India, but it did not deal with the legislative structure.
 Government of India Act of 1935: Expanded the concept of a bicameral legislature to the provinces and laid down a federal structure for India, but the initial introduction at the central level was by the 1919 Act.