Final answer:
There are two sessions of Congress each year, confirming answer c) Two as correct. This reflects the practice of the United States Congress to have two sessions within each two-year term.
Step-by-step explanation:
The question posed is: How many terms of Congress are there in a year? The answer is c) Two. According to Section 4 Clause 2 of the U.S. Constitution, Congress is required to meet at least once per year. However, in modern practice, Congress has two sessions within each term. A term of Congress lasts two years, with each year constituting a separate session. This can also be confirmed by the 20th Amendment, which moved the opening day of Congress to January 3rd, indicating the beginning of each new session within the term of Congress.