Exp) Option b is the correct answer.

Statement a is correct: Departmental Standing Committee consists of 31 members (21 from Lok Sabha and 10 from Rajya Sabha). The members of the Lok Sabha are nominated by the Speaker from amongst its own members, just as the members of the Rajya Sabha are nominated by the Chairman from amongst its members.

Statement b is incorrect: The Public Account Committee (PAC) is not vested with the power of disallowance of expenditures by the departments. The committee just examines public expenditure from legal and formal point of view to discover technical irregularities.

Statement c is correct: Consultative Committees are constituted by the Ministry of Parliamentary Affairs. These are attached to various ministries/departments of the Central Government. They consist of members of both the Houses of Parliament.

Statement d is correct: A house can recommend a bill to a Select Committee by adopting a motion. The Select Committee considers the Bill clause by clause just as the two Houses do.