The highlighted part of the sentence is called a/an Professor Plum , who had been to the mansion before , expertly navigated the maze of rooms andcorridors to quickly reach the conservatory
I think this is what you are wanting to know. You would use a not an If the word/name (Professor Plum) would have been something starting with a vowel instead, you would use an
Is this what you were asking?
Mr. Enfield I don't remember if he was a cop or not
Answer:
Incorrect punctuation between elements
I'm not entirely sure tho
To keep the population up
D. Students. It would affect the student body the most, and I doubt teachers would like to or need to "take a stand on what you wear". Hope this helps :)
