In the question, one sentence is given and four words are given in bold denoted by (A), (B), (C) and (D). You have to decide which of the following is inappropriate in context. If all the words are appropriate in the context then mark ‘All correct’ as your answer.

Invigilating (A) journalism is right and proper when it is backed (B) up with documents, interviews (C) with responsible witnesses, and other primary (D) sources.