What made Aswan’s location helpful for trade?

It was located close to Memphis.
It was located on the Red Sea coast.
It was located on the Nile River near Nubia.
It was located on the Mediterranean Sea coast.

I’m his published 95 theses, martin luther protested against? a-the selling of indulgences within the catholic church b-the belief in predestination c-the worshipping of statues of saints d- the catholic church focus on faith as the sole means of salvation