Which of the following are some reasons for the variations in agricultural practices around the world?

a.

topography

b.

tradition

c.

amount of rainfall

d.

all of the above

Agricultural practices will vary around the world for reasons connected to all of the options outlined as a, b and c below. So the correct answer here is actually option D. Ie All of the above. Topography or the shape of the land might make it unsuitable for an arable purpose, tradition might mean that the practice of farming pigs in an area would not be commercialy viable if there were no market for it and if there is too much or too little rainfall that will directly impact the next choices for the farmers success.