Read the following context and choose the best option to answer the question.
Context: I was the the beach yesterday ; somehow it was a rather quiet day at the beach ( for a Saturday ) . I was sitting on a beach towel enjoying the breeze and staring at the ocean , one of my favourite past times . At one point I took of my sunglasses and looked out . The sun was much too bright and I had to put them back on immediately .
Question: Why would they be worried about staring directly at the sun ?
Options: 
A. Because doing so at the beach is considered rude .
B. Because they had been told to always wear sunglasses at the beach .
C. Because doing so can cause permanent eye damage .
D. None of the above choices .


C