Are you for or against driverless cars, and why? I give Brainliest! (Easy points) Please no links!

Brown party's views on industry and agriculture

Which of the following was probably the most difficult challenge facing construction of the railroad?

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.