The picture shows us how the Sun's rays strike Earth. Because of the Earth's tilt on its axis, some parts of Earth are having summer and others, winter. What letter or letters on the Earth are experiencing summer?

Region B and C experience summer because they are infront of sun and direct solar radiation.
The tilt of the Earth on its axis affects the angle at which the Sun's rays hit the Earth. Tilting is responsible for occurance of seasons. That region which experience direct sunlight has summer season.
So we can conclude that Region B and C experience summer because they are infront of sun and direct solar radiation.
Learn more about earth here: https://brainly.com/question/18496962