Lines of longitude range from 0 at the prime meridian to on a meridian in the mid-pacific ocean.
a. 90
b. 180
c. 60
d. 360

They range from 0 degrees (passing though Europe and Africa) to 180 degrees- the correct answer is b.

There are two hemispheres - Eastern and Western, and they both have 180 degrees - which in total makes 360 degrees - like every circle, which has 360 Degrees

Dis the answer you perception is how you see the world 

Where is the map from the question?