Which of the following statements is wrong? a. Atmospheric mirages are created by light passing through and being bent b

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Which of the following statements is wrong?
a. Atmospheric mirages are created by light passing through and
being bent by air layers of different densities. Such changes in
air density are usually caused by sharp changes in air
temperature.
b. Due to the refraction of light within the atmosphere, star on
the sky often appears to be higher than it actually is.
c. As we look at a rainbow, we see only one single color from
each drop. The color red comes from higher drops and the color
violet from lower drops.
d. When the air near the ground is much warmer than the air
above, objects may appear to be displaced and higher than they
really are. These mirages are called superior mirages, or upward
mirages.