Considering the grammatical and semantic aspects of text...

Considering the grammatical and semantic aspects of text I, decide whether the following items are right (C) or wrong (E).

There would be no change in the meaning of the passage from “Often” (l. 2) to “duplicity” (l.4) if it were replaced by Even though it is often confused with espionage, which is its illegitimate cousin, diplomacy has been linked with misbehaviour and duplicity for centuries.