If a representative of Congress dies before their two-year term is up, a special election is held to fill their seat.

a. True
b. False

a. True.

To determine the answer to this question, you can refer to the United States Constitution, which outlines the process for filling vacancies in the House of Representatives. According to Article I, Section 2, Clause 4, of the Constitution, "When vacancies happen in the Representation from any State, the Executive Authority thereof shall issue Writs of Election to fill such Vacancies." This means that if a representative of Congress dies before completing their two-year term, a special election is indeed held to fill their seat. Therefore, the correct answer is true.