Read the following context and choose the best option to answer the question.
Context: The hardest part of that was watching the blinking light in middle while red lines and dots moved around . Afterward , the doctor wanted to view the images with me . I had about 3 really big areas were I ' m leaking and had a few new blood vessels growing . He was surprised to see that my retina was swelling though ( ? ) .
Question: Why am I at the doctors with a swollen retina ?
Options: 
A. None of the above choices .
B. I 'm at the doctors with a swollen retina due to the 3 areas where I 'm leaking .
C. My retina is swollen from the blinking lights .
D. I may have suffered an injury recently that caused swelling .


D