Presidential electors were chosen to represent the interests of
a. parties
b. districts
c. states
d. candidates

Presidential electors were chosen to represent the interests of states. The correct option among all the options given in the question is option "c". The Presidential electors will have to first get selected from their states before they can go for the selection of the president and the vice president. As they represent their states, so they normally represent the interest of their states.