A common visual illusion at night when approaching an upsloping runway is that the pilot perceives

Choices

• the airplane is too low and tends to fly higher than the proper glide path, often resulting in landing long.

  Reversed — upsloping runway creates a high illusion, not low.

• ✓ the airplane is too high and tends to fly lower than the proper glide path, risking an undershoot or controlled flight into terrain short of the runway.correct

  An upsloping runway makes the runway appear closer/larger than it would for a normal level runway, fooling the pilot into thinking they're high. Natural correction: go lower — risking undershoot or CFIT short of the runway. Downsloping has the opposite illusion (appears low → fly higher → risk overshoot).

• no illusion; upsloping runways are visually neutral.

  Runway slope is a major source of approach illusion.

• the airplane is rolling, even when wings are level.

  That's the leans (vestibular illusion), unrelated to runway slope.