Q. The Central Pollution Control Board was established according to which of the following act?

[A] Water (Prevention and Control of Pollution) Act, 1974

[B] Air (Prevention and Control of Pollution) Act, 1981

[C] Environment (Protection) Act, 1986

[D] Forest conservation act, 1980

Answer: A
Notes:

The Central Pollution Control Board (CPCB), statutory organization, was constituted in September, 1974 under the Water (Prevention and Control of Pollution) Act, 1974.  

Further, CPCB was entrusted with the powers and functions under the Air (Prevention and Control of Pollution) Act, 1981. 

Source: https://cpcb.nic.in/Introduction/