Option 1: (B), (D), (C), (A) -> Creates a fragmented sentence starting with a verb without a subject.
Option 2: (D), (A), (C), (B) -> Forms a logical sentence: "Those suffering from glaucoma find that their peripheral vision is impaired and they can no longer see objects not directly in front of them."
Option 3: (C), (A), (D), (B) -> Begins with "is impaired" without establishing what is impaired first, creating grammatical confusion.
Option 4: (A), (B), (D), (C) -> Lacks proper subject-verb agreement and creates a disjointed structure.
Hence, Option 2: (D), (A), (C), (B) -> This sequence correctly begins with the subject "those suffering from glaucoma," followed by the verb phrase describing what they experience. The sentence logically explains that glaucoma patients discover their peripheral vision is impaired, resulting in inability to see objects not in their direct line of sight. -> correct