What is the difference between a regular session of congress and a special session of congress?
a) a regular session has all the members, while a special session only has a few members
b) a regular session is for making laws, while a special session if for debate only
c) a regular session is just for the members of congress, while a special session is for guest speakers.
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.
**i believe the answer is d. i just want to make sure though.

period of time which, each year, Congress assembles and conducts business

where special session is extra ordinary and deal with emergency

so correct option is

 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

so its D 

hope it helps

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.

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.