A fertile or green area in an arid region
A.
B.
C.
D.
Answer & Solution
Solution:

  Oasis is a fertile area in a desert or arid region, often containing water.

  Barren (A) refers to land that is unable to support plant life, opposite of an oasis.

  Dune (C) is a mound or ridge of sand, not fertile land.

  Flora (D) refers to plant life in general, not specific to an arid region.

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