Concept:Ending a session of parliament by royal proclamation is a formal act that pauses, not abolishes, the parliament.
Explanation:A session of parliament ends when it is prorogued.
Prorogation is done by royal proclamation or executive authority.
It stops parliamentary business until the next session begins.
Adjournment only pauses business within the same session.
Dissolution ends the life of parliament and leads to fresh elections.
Expiration applies to a fixed term, not to a royal proclamation.
Therefore, ending a session by royal proclamation is prorogation.
Answer:B. Prorogation of parliament.