UV rays is higher in summer as

The correct option is: sun is closer to planet earth so UV rays have a shorter distance to travel and reach us.

During the summer season, the tilt of the Earth's axis brings the hemisphere experiencing summer closer to the Sun. As a result of this orientation, the distance that solar radiation, including ultraviolet (UV) rays, needs to travel through the Earth's atmosphere is minimized.
When the path length of the sun rays through the atmosphere is shorter, there is less scattering and absorption of the high-energy UV radiation by air molecules, ozone, and aerosols.
Consequently, a larger fraction of intense UV rays penetrates the atmosphere and reaches the Earth's surface, resulting in higher UV levels during summer.