Explanation

The core principle underlying the Parliamentary System of Government (Westminster model) is the collective responsibility of the Executive to the Legislature:

– Option B is correct: Under Article 75(3) of the Constitution of India, the Council of Ministers is collectively responsible to the Lok Sabha. The government remains in power only as long as it commands the confidence of the majority of the popular House, and it can be removed at any time through the passage of a No-Confidence Motion.
– Option A is incorrect: A parliamentary cabinet represents the majority party or ruling coalition, not all political parties in Parliament.
– Option C is incorrect: The political executive (Prime Minister and Cabinet) is elected indirectly through parliamentary representatives, not directly by popular vote.
– Option D is incorrect: Having a fixed executive tenure that cannot be removed by the legislature describes the Presidential System, not the Parliamentary system.

Therefore, the correct answer is Option B.