Which of the following was not an achievement made during the hellenistic period?
a. the compound pulley
b. the navigational compass
c. the understanding of arithmetic and geometry
d. a method for calculating the circumference of the earth

While knowledge of mathematics, computation of volume, geometry were very characteristic of the Greeks and Hellenistic period, what is not their invention and achievement found during the Hellenistic period is a navigational compass.  Compass first appeared in primitive form and purpose during the Han dynasty in China around 206 BC, much later becoming the means of navigation, during the Song Dynasty, also in China. According to some data, the use of the compass in Western Europe and the Islamic world was recorded in the 12th century.

The answer is: b.

step-by-step explanation:

it is the code of hammurabi