Please Read the Following Paragraph and Then Answer the Following

Please read the following paragraph and then answer the following question(s) .
The human eye is an incredible organ, capable of gathering light to focus on images near and far, in bright light or dim, and with quick adjustments between these extremes. However, as eyes age, the ability to focus closely gradually declines as the flexibility of the eye's lens decreases. Some eye problems, such as cataracts, are more likely to develop in people who are more exposed to natural sunlight.
-Bloodshot eyes reflect increased blood flow to the eye surface because of irritants such as dust and smoke.These swollen blood vessels are located on the ______.

A) cornea
B) sclera
C) iris
D) lens