The line where the earth seems to meet the sky
A.
B.
C.
D.
Answer & Solution
Solution:

  Horizon is the apparent line where the earth and sky meet.

  Firmament (A) refers to the sky or heavens, but not the line where earth and sky appear to meet.

  Rainbow (C) is a meteorological phenomenon, not a line.

  Orbit (D) refers to the path of a celestial body, not the line where earth and sky meet.

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