Final answer:
The increased tilt of the Northern Hemisphere toward the Sun during its summer season leads to an increase in sunlight, resulting in longer days and higher temperatures.
Step-by-step explanation:
When the Earth moves so that the Northern Hemisphere is tilted more toward the Sun, the amount of sunlight increases in this hemisphere. This is because the tilt of Earth's axis (23.5°) directs more sunlight to the Northern Hemisphere, resulting in longer days and short nights, leading to warmer temperatures that characterize summer in that part of the world.
In contrast, the distance from the Sun does not significantly change for either hemisphere to affect the seasons. Also, during this time, the Southern Hemisphere is tilted away from the Sun, leading to shorter days, longer nights, and cooler temperatures. Therefore, the correct answer is A. The amount of sunlight increases in the Northern Hemisphere.