单项选择题
A.IF(A2〉=2000,高原,〈=200,平原,高地)B.IF(A2〉=2000,"高原",〈=200,"平原","高地")C.IF(A2〉=2000,"高原",IF(A2〈=200,"平原","高地")D.IF(A2〉=2000,"高原",IF(A2〈=200,"平原","高地"))