The correct answer is A. 2000.
The Central Government gave its consent for the establishment of Sainik School in Haryana in 2000. The school was established in 2001 and is located in Gurgaon. It is one of the 33 Sainik Schools in India. Sainik Schools are residential schools that provide education and training to boys and girls for entry into the National Defence Academy (NDA) and other defence services.
The school has a strong academic curriculum and also offers a variety of extracurricular activities. The school has produced many successful students who have joined the defence services.
Option B is incorrect because the Central Government gave its consent for the establishment of Sainik School in Haryana in 2000, not 2005.
Option C is incorrect because the Central Government gave its consent for the establishment of Sainik School in Haryana in 2000, not 2010.
Option D is incorrect because the Central Government gave its consent for the establishment of Sainik School in Haryana in 2000, not 2018.