There is a Parliamentary System of Government in India because the

Explanation

Option A points to a democratic system. It does not necessarily mean a Parliamentary Democratic system. For e.g. in USA the Congress is also elected, but it is a Presidential Democracy. Option D is correct because “Collective responsibility” of the council of ministers to the Lok Sabha (Article 75) lies at the heart of a Parliamentary democracy.Tikdam: Parliamntary stystem meaning executive part of legislature and accountable to it as opposed to presidential where Executive is not part of legislature