Which best describes why voters choose political candidates? to represent their interests in the economy to create policies that favor them to get rid of policies they do not like to represent their interests in government

D) to represent their interests in government
A is incorrect because political candidates can effect economy but that is not the main purpose of their jobs, their main purpose is in government.
B and C are incorrect because electing a political candidate does not create or get rid of policies. A political candidate had a political party, a political party as an umbrella - or grouped ideas - that it will strive to work towards. 
So we are left with D as the correct answer.