The correct answer is: D. June 22; December 22
The North Pole is located on the top of the Earth’s axis, and the Earth’s axis is tilted at an angle of 23.5 degrees relative to the plane of its orbit around the Sun. This means that the North Pole experiences six months of daylight and six months of darkness each year.
During the summer solstice, which occurs on June 22 in the Northern Hemisphere, the North Pole is tilted towards the Sun. This means that the Sun is visible 24 hours a day at the North Pole.
During the winter solstice, which occurs on December 22 in the Northern Hemisphere, the North Pole is tilted away from the Sun. This means that the Sun is not visible at all at the North Pole.
The other options are incorrect because they do not correspond to the dates of the summer and winter solstices.