The correct answer is: A. Entry 17, List III in Schedule VII Prevention of Cruelty to Animals.
The Constitution of India gives the Central Government the power to legislate on cow slaughter under Entry 17, List III in Schedule VII Prevention of Cruelty to Animals. This entry empowers the Central Government to make laws on all matters relating to the prevention of cruelty to animals, including cow slaughter.
The other options are incorrect because:
- Option B, Residuary Powers under Article 248, is incorrect because the Central Government does not have residuary powers in matters relating to cow slaughter.
- Option C, Emergency Powers, is incorrect because the Central Government can only use emergency powers in times of grave national emergency.
- Option D, Article-48 in the Directive Principles, is incorrect because the Directive Principles are not enforceable in a court of law.
I hope this helps! Let me know if you have any other questions.