Answer:
B.
Step-by-step explanation:
The sentence is too long and it is missing proper punctuations(like a comma). Reading it without punctuation does not provide room for breathing and therefore needs editing. It will be correct if framed like this; Although you may not have received the e-mail, we have been informed that the division head of the Finance Department is leaving at the end of the month. This sentence has a comma in the right place.