To determine the position at which the northern hemisphere is experiencing spring, we must consider the Earth's position in its orbit around the sun and the corresponding seasons in the Northern Hemisphere.
The Earth experiences different seasons due to the tilt of its axis. Here is a brief overview of the positions related to the seasons:
1. Point A - This position corresponds to the Summer Solstice in the Northern Hemisphere. The Northern Hemisphere is tilted most directly towards the sun, resulting in the longest day of the year.
2. Point B - This position corresponds to the Autumnal Equinox. At this point, both hemispheres receive equal amounts of sunlight, marking the start of fall in the Northern Hemisphere.
3. Point C - This position corresponds to the Winter Solstice in the Northern Hemisphere, where the Northern Hemisphere is tilted away from the sun, resulting in the shortest day of the year.
4. Point D - This position corresponds to the Vernal Equinox. At this point, both hemispheres again receive an equal amount of sunlight, marking the start of spring in the Northern Hemisphere.
Considering these points, the correct position where the Northern Hemisphere is experiencing spring is:
Point D
Thus, the correct answer is:
```plaintext
Point D
```
