49.
The answer is: A
Explanation
The correct option is A: religion, race, caste, sex, descent, place of birth, residence.
This is because Article 16 of the Indian Constitution states that no citizen shall be discriminated on grounds only of these factors or any of them in matters of public employment or office under the State. These are the same grounds as mentioned in Article 15, which prohibits discrimination on general grounds. However, Article 16 also includes residence as a ground of discrimination, which is not covered by Article 15. This is to ensure that citizens from different states or regions have equal access to public services and offices in any part of the country.