Please help due tomorrow

Ineed to do my math homework and i am dumb so i need a smart person to me do math so just say sum if u good at math and i will give u my phone number to me with math

How are the republican and democratic presidential candidates chosen? a. they are nominated by their state governments. b. each is nominated by his or her respective party. c. each is chosen by the governor of his or her home state. d. they are chosen by the house of representatives.

What’s the answer this this question