Explanation
$$\textbf{Correct option: D}$$
$$\textbf{Solution:}$$
Option A:
$$\bullet$$ Radiation fog forms after sunset when the ground starts cooling down by infrared thermal radiations.
$$\bullet$$ Usually, radiation fog forms at night and get vanished after sunrise. But, in winter months, it persists all day long, specially in the areas which are surrounded by high ground like a valley.
$$\bullet$$ Valley fog is the radiation fog.
$$\bullet$$ Radiation fog is not more susceptible on hill tops.
Option B:
$$\bullet$$ Summer fog forms when moist air passes over cool surface. It occurs in areas like coastal area of California.
$$\bullet$$ It has been seen that the summer fog decreased by $$33\%$$ in California during 20th century.
$$\bullet$$ This decrease in summer fog is affecting the climate change of California and its affects has been seen on its ecology.
$$\bullet$$ For example, Redwoods are not growing well in the coastal area of California due to this climate change caused due to decrease in summer fog.
Option C:
$$\bullet$$ Fog refers to a visible suspension of fine liquid and solid particles in air near the earth's surface.
$$\bullet$$ It is composed of very tiny water droplets and can have ice crystals.
Option D:
$$\bullet$$ All the given statements are correct.
Hence the correct option is option D.
A polar bear has the thick fur all over the body, except the tip of the nose. This insulates them from cold, even when they are in the water. Their fur has another use, hairs reflect light making the polar bear look white and helping them camouflage among the snow and ice. They have padded feet, help when running or climbing on ice. So, yes it is true 'A polar bear can survive in polar regions because of thick fur and padded feet'.
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