Option 1 -> (B), (C), (A), (D) creates a fragmented sentence starting with "revolutionising" without a clear subject.
Option 2 -> (D), (C), (B), (A) begins with "world through digital platforms" which lacks proper introduction and context.
Option 3 -> (B), (A), (D), (C) starts with "revolutionising" and ends with "has become increasingly" - grammatically incomplete.
Option 4 -> (C), (A), (D), (B) forms: "Online education has become increasingly popular providing access to learning across the world through digital platforms and virtual classrooms revolutionising traditional teaching methods globally" - a complete, coherent sentence.
Hence, Option 4: (C), (A), (D), (B) -> This sequence properly establishes the subject (online education), describes its status (increasingly popular), explains how it functions (providing access across the world through digital platforms), and concludes with its impact (revolutionising traditional teaching methods globally) -> correct