C. The northern hemisphere is tilted toward the sun.
The Earth orbits the sun at an angle. With this, the northern hemisphere is a little bit tilted towards the sun. This is the June solstice, also known as the summer solstice. There are two solstices in a year; one during summer (June solstice or summer solstice), and one during the winter (December solstice or winter solstice) where the sun is tilted away from the sun.