Which of the following statements is true?

a. U.S. Senators and Representatives are the voice of their whole state in the U.S. government.

b. U.S. Senators and Representatives are the voice of part of their state in the U.S. government.

c. U.S. Senators are the voice of their whole state; U.S. Representatives are the voice of part of their
state in the U.S. government.

d. U.S. Senators are the voice of part of their state; U.S. Representatives are the voice of part of their
whole state in the U.S. government.