Final answer:
A term of Congress refers to the entire duration that elected officials serve, whereas a session is just a part of the term during which Congress meets to conduct business. A term is longer than a session.
Step-by-step explanation:
In the context of the United States Congress, the difference between a term and a session is significant. A term of Congress is the length of time that representatives or senators serve after being elected, which is two years for the House of Representatives and six years for the Senate at the federal level. However, within each term, there are sessions. A session is the period within the term that Congress meets to conduct its business, typically lasting one year. There are usually two sessions in each term of Congress.
So, in answer to the question 'Which is longer, a term or a session of Congress?' the correct choice is (d) A term, because a session is just a part of a term—specifically, one of the two annual gatherings that occur within a term.