What is one way of trying to determine the direction of writing?

One way of trying to determine the direction of writing is to look at the left hand side of the text and determine if there's a cramping of signs. Whichever side the cramping is on, it is suggested that the direction starts from the opposite side as words are often cramped at the end of the lines

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;