Explanation:

• A session of Parliament consists of many meetings. Each meeting of a day consists of two sittings, a morning sitting and a post-lunch sitting. A sitting of Parliament can be terminated by adjournment or adjournment sine die or prorogation or dissolution (in the case of the Lok Sabha).

• The presiding officer (Speaker or Chairman) declares the House adjourned sine die, when the business of a session is completed. Within the next few days, the President issues a notification for prorogation of the session. However, the President can also prorogue the House while in session. Unlike an adjournment, prorogation not only terminates a sitting but also a session of the House. Hence, option c is correct.

• Adjournment sine die means terminating a sitting of Parliament for an indefinite period. So, when the House is adjourned without naming a day for reassembly, it is called adjournment sine die. On the other hand, an adjournment suspends the work in a sitting for a specified time, which may be hours, days or weeks. The power of adjournment as well as adjournment sine die lies with the presiding officer of the House. He can also call a sitting of the House before the date or time to which it has been adjourned or at any time after the House has been adjourned sine die.

• Rajya Sabha, being a permanent House, is not subject to dissolution. Only the Lok Sabha is subject to dissolution. Unlike a prorogation, a dissolution ends the very life of the existing House, and a new House is constituted after general elections are held