The correct answer is: B. Article 12
Article 12 of the Indian Constitution defines the term “State” to include the Government of India, the Government of any State and any local or other authority within the territory of India or under the control of the Government of India.
Article 15 prohibits discrimination on the grounds of religion, race, caste, sex, place of birth or any of them.
Article 17 abolishes untouchability and prohibits its practice in any form.
Article 20 provides for protection in respect of conviction for offences.
Article 12 is the most relevant article in this context as it defines the term “State”. The other articles are not relevant as they deal with different issues.