The first one. The use of irrigation.
Answer:
The best answer is mountains and valleys
Explanation:
first option doesn't seem correct because it doesn't have one giant plateau. Instead it is multiple. so that option is incorrect.
second option is incorrect because there really is no evidence about plains and hills.
third option is incorrect for the same reason as second option.
The Fourth option is correct because Sub-saharan contains mountain ranges and multiple rift valleys.
(have a nice day and soon merry christmas or happy Hanukkah)
<span>Mechanical </span><span>weathering occurs more rapidly in climates that experience frequent freezes and thaws
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Lincoln's presidential election in 1860.
Hope this helps.
