Step 1: Apply the opener test: C starts with "Early data suggested", which needs a prior subject for the data to be "early" about, so it cannot open. D starts with "Over time, though", a contrast that needs a prior claim, so it cannot open. A starts with "Consequently", needing a prior cause, so it cannot open. Only B, "Remote work expanded dramatically as organisations adapted to distributed teams", introduces the topic cleanly, so B opens.
Step 2: After introducing remote work's expansion in B, the natural next step is reporting on how it performed early on: C, "Early data suggested that productivity held steady, but employees increasingly reported feelings of isolation", follows B directly, since "early data" logically follows an "expansion" just described.
Step 3: D opens with "Over time, though", a contrast signal that builds on the isolation concern just raised in C, and extends it: "purely remote arrangements revealed drawbacks that were not obvious at first", so D follows C.
Step 4: A opens with "Consequently", meaning as a direct result of the drawbacks named in D, "many firms have shifted to hybrid models", making it the concluding sentence.
Step 5: The chain B then C then D then A matches option (b).
Correct option: (2) BCDA.