Answer: (Detailed Solution Below)
Option B: Parliament, if requested by concerned States
Detailed Solution:
The correct answer is “Parliament, if requested by concerned States”.
A Joint Public Service Commission for two or more states in India can be established by Parliament, if requested by the concerned states.
This provision is outlined in Article 315 of the Indian Constitution, which allows for the establishment of a joint commission for the states that choose to come together to create such an arrangement.