Article 51 A of the Indian Constitution stresses upon _______.
Option D is the correct answer because it is mentioned in the paragraph ‘Article 51 A of the Indian Constitution stipulates that is the duty of every citizen to protect the environment. So, option D is the right answer.
Option A is incorrect because article 51 A emphasizes on protection of the environment as a whole and not just protection of trees. Thus, option A is not the right answer.
Option B is incorrect because article 51 A emphasizes on protection of the environment as a whole and not solely for the environment of birds. Thus, option B is not the right answer.
Option C is incorrect because it is mentioned in the paragraph that ‘Article 51 A of the Indian Constitution stipulates that is the duty of every citizen to protect the environment’. Thus, option C is not is not the right answer.