Detailed Solution:
The correct answer is “Both (a) and (b)”.
Article 48A of the Directive Principles states that the State shall endeavor to protect and improve the environment and safeguard forests and wildlife.
Article 51A(g) of the Fundamental Duties states that it is the duty of every citizen to protect and improve the natural environment, including forests, lakes, rivers, and wildlife, and to have compassion for living creatures.