Option 1: (C), (A), (D), (B) -> Forms: "High blood sugar levels associated with diabetes can cause the blood vessels to leak or swell, leading to vision impairment and potential blindness" - grammatically correct and logically coherent.
Option 2: (A), (C), (B), (D) -> Creates a fragmented sentence with misplaced phrases that lacks proper flow.
Option 3: (A), (B), (C), (D) -> Produces an illogical sequence where "impairment and potential blindness" is placed before its cause.
Option 4: (C), (B), (D), (A) -> Results in a jumbled sentence with the main clause appearing at the end incorrectly.
Hence, Option 1: (C), (A), (D), (B) -> This sequence creates a medically accurate and grammatically sound sentence explaining how high blood sugar levels in diabetes lead to diabetic retinopathy complications -> correct