Explanation:

All of the above

Both DPSP and Fundamental Rights conferred responsibility on both state as well as individuals to protect the environment and biodiversity of India. (Correct)

Both the Directive Principles of State Policy (DPSP) and Fundamental Rights in the Indian Constitution contain provisions that emphasize the responsibility of both the state and individuals to protect the environment and biodiversity.

Article 51-A (k) provides that it shall be the duty of every citizen as well as corporation to protect and improve the environment. (Correct)

Article 51-A (k) of the Indian Constitution imposes a fundamental duty on every citizen and corporation to protect and improve the environment.

The Environment (Protection) Act was passed after the Earth Summit. (Correct)

The Environment (Protection) Act was enacted in 1986, after the Earth Summit held in 1972.

Therefore, all the statements are correct, and the correct answer is "All of the above."