The correct answer is option 'D': Falls slantly.

Explanation:
During the winter season, the sun rays fall slantly or at an angle. This means that the sun is lower in the sky and the angle of the sunlight is more acute compared to other seasons.

There are a few factors that contribute to the slanting of the sun rays during winter:

1. Earth's Tilt: The Earth is tilted on its axis by about 23.5 degrees. This tilt causes the angle at which sunlight reaches different parts of the Earth to vary throughout the year. During winter, the hemisphere that is tilted away from the sun experiences shorter days and lower sun angles, resulting in slanting sun rays.

2. Sun's Position: The position of the sun in the sky changes throughout the year due to the Earth's orbit around it. In winter, the sun is lower in the sky as it follows a shorter and lower path, resulting in slanting sun rays.

3. Atmosphere's Effect: The Earth's atmosphere scatters and absorbs sunlight as it passes through. During winter, the sun's rays have to pass through a greater portion of the Earth's atmosphere, which scatters the sunlight and makes it appear slanted.

Effects of Slanting Sun Rays:

1. Longer Shadows: The slanting sun rays during winter create longer shadows because the angle at which the sunlight reaches objects is more acute. This is especially noticeable during early morning and late afternoon when the sun is closest to the horizon.

2. Reduced Sunlight Intensity: Since the sun's rays have to pass through a thicker portion of the Earth's atmosphere during winter, the sunlight is more scattered and less intense. This is why winter days tend to be cooler compared to summer days when the sun is more directly overhead.

In conclusion, during the winter season, the sun rays fall slantly due to the Earth's tilt, the sun's position, and the scattering of sunlight by the Earth's atmosphere. This slanting of sun rays affects the intensity of sunlight and creates longer shadows.

During winter season the sun rays do not fall directly in the region / falls santly