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A plane whose vertical trace is parallel to the reference line and which has no horizontal trace is

  • A.inclined to both principal planes
  • B.parallel to the horizontal plane
  • C.parallel to the vertical plane
  • D.perpendicular to both principal planes

Answer: B

Correct answer: parallel to the horizontal plane

A plane with no horizontal trace never meets the horizontal plane, so it must be parallel to it; and it meets the vertical plane in a line parallel to the reference line, which is the vertical trace described. The mirror case, a plane with only a horizontal trace parallel to the reference line, is parallel to the vertical plane.

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