Why was the electoral system for the presidency so complex and indirect?

a$.$

It was purposefully designed to prevent the rise of a monarchy.

b$.$

It was designed that way to prevent Native Americans and immigrants from voting.

c$.$

The delegates were inexperienced with no precedent to follow.

d$.$

It took a long time to collect all the nation$$s votes due to the size of the United States.

e$.$

It was designed that way because delegates did not trust voters to choose qualified candidates for president or vice president directly.