A Parliamentary System of Government is one in which

1. A

   all political parties in the Parliament are represented in the Government

   All parties in government. Coalition, not the definition.

2. B

   the Government is responsible to the Parliament and can be removed by it

   Government responsible to the Parliament (Lok Sabha). Collective responsibility.

3. C

   the Government is elected by the people and can be removed by them

   Elected and removable by the people directly. That is a presidential/recall mix.

4. D

   the Government is chosen by the Parliament but cannot be removed by it before completion of a fixed term

   Chosen by Parliament but fixed term. That denies no-confidence.

Summary. Official key is (b). Parliamentary government means the Council of Ministers is responsible to the popular House and can be removed by it. It is not a national-front cabinet, a direct recall, or a fixed-term executive.