Answer:
D) A regular session is scheduled for a specific period of time each year, while a special session is called by the president at any time.
Step-by-step explanation:
A special session of the congress, also called an extraordinary session, is when the congressmen are gathered outside of the established session time in order to finish debating and voting uncomplete tasks that are often delayed for disagreements between the political parties. A special session can be called by the spolesperson of the legislature, by the president at any time or by voting of the legislature on a regular session.