the regular period of time during which congress conducts its business is called a

a. prorogue
b. session
c. special session
d. term

uhm, prorogue isnt in the textbook.
d?

I'll bet this information is in your book:

http://www.thegreenpapers.com/Hx/SessionsExplanation.html

The regular period of time during which Congress conducts its business is called a session. So, the correct answer would be b. session.

To arrive at this answer, you can eliminate option a. prorogue because, as you mentioned, it is not mentioned in your textbook. Option c. special session refers to an extra session called outside the normal period, so it does not fit the regular period mentioned in the question.

Option d. term usually refers to the length of time a member of Congress serves in office, not the period during which Congress conducts its business. Therefore, option d. is not the correct answer.

By a process of elimination, you can deduce that the correct answer is b. session.