I think the Choroid is the part with the most blood vessels, found in the three tunics of the eye.
I know that B applies, and D might apply assuming it means certain materials can pass through and not all materials can pass through.
Answer:
Drug diversion and card sharing.
Explanation:
Medicare\Medicaid fraud or abuse is when someone is trying to intentionally deceive Medicare and also falsifying documents or Medicare cards and they are dangerous.
Drug diversion and card sharing are the two most common examples. Drug diversion is when the prescriptions are written without a need for that, or altering some kinds of prescriptions for selling or using them.
Card sharing is when someone is sharing their Medicaid Identification card.