Please help me with this homework

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.

Why did kennedy choose lyndon b. johnson to be his running mate

Who was the governor of the spanish territory of louisiana who offered financial assistance as well as military supplies to the patriot cause?