Correct Answer:
B. Punjab Enforcement & Regulatory Authority
In legal and regulatory acts, the term "Authority" is almost always explicitly defined in the initial sections to refer to the specific body established by that Act to carry out its provisions. Therefore, Punjab Enforcement & Regulatory Authority is the correct definition, as it names the specific entity responsible for enforcement and regulation under the Act. The Punjab Police, District Board, or Home Department are distinct governmental or administrative entities with different mandates and are not typically referred to simply as "the Authority" within the context of an Act establishing a specialized regulatory body.