Question

How would you say good-bye to a friend whom you might not see for a long time?
Hasta luego.
Hasta pronto.
Hasta ahora.
¡Adiós!
Hasta mañana.

Answer 1

Adios would be correct since it's just goodbye.
Hasta luego - See you later (like an hour or so)
Hasta pronto - See you soon.
Hasta ahora - See you now.
Hasta manana - See you tomorrow

Answer 2

yeah adios means good bye

Answer 3

Adios is goodbye