The key there is that the question is asking about a specific type of clustered index scan, specifically one that runs in the logical order of the index. Hence the answer cannot be B as that's just a general clustered index scan with no mention of any order that it was run in.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability