I'd go for D as well. It's concise and to the point.
C doesn't have a verb.
As the subject in the subordinate clause is "the original AEC Routemaster", the subject in the main clause should be the same, i.e, "this familiar red double-decker bus". Eliminate B and E.
A is wordy.
C doesn't have a verb.
As the subject in the subordinate clause is "the original AEC Routemaster", the subject in the main clause should be the same, i.e, "this familiar red double-decker bus". Eliminate B and E.
A is wordy.


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