Final answer:
There are currently 100 senators in the U.S. Senate, with each of the 50 states electing two senators to serve six-year terms.
Step-by-step explanation:
There are 100 senators serving in the U.S. Senate today, reflecting the configuration of Congress as a bicameral institution. Voters in each of the 50 states elect two senators, who each serve staggered six-year terms. The Senate's role is to represent the states at the federal level, and this originally-designed structure has been upheld since the early days of the United States, with direct election of senators being in place since the ratification of the 17th Amendment in 1913. Therefore, the correct answer to the question is a) 100.