Once an environmental bill becomes a law, who is usually responsible for the enforcement?

a regulatory agency

citizens

a legislature

the president or prime minister

The answer is the president or the prime minister.

Explanation:

Whenever any bill has to be passed, it must pass both the houses by a majority of vote.

When it has been passed with majority, the bill comes to the President.

If the President signs that bill, it becomes a law.

This process is called "overriding a veto."

Therefore, the president or prime minister is usually responsible for the enforcement.

Option D

the president or prime minister

Usually whenever law in formed, it is the president who forms a delegation (a regulatory or administrative body) which shall be responsible for implementing the law.