Final answer:
When the ozone layer is damaged, more UV radiation reaches the Earth's surface, potentially causing various health and environmental problems such as skin cancer and damage to marine life.
Step-by-step explanation:
The ozone layer acts as a shield in the stratosphere, absorbing most of the sun's harmful UV radiation. When this layer is damaged, it results in an increased amount of UV radiation penetrating through the atmosphere and reaching the Earth's surface. This additional UV radiation can lead to a variety of environmental and health issues, such as an increase in skin cancers, cataracts, and damage to crops and marine ecosystems. Hence, the correct answer to the student's question is B. More UV rays reach the Earth’s surface.