Answer:
C) interoffice memo
Explanation:
Interoffice memorandums (memos) are formal ways of communicating within an organization. They are basically formal letters that must include the recipient (who should receive the memo), the sender, the date and the subject of the memo.
In this case, you are dealing with a very sensitive and confidential subject, salaries and benefits are always sensitive subjects, so you must communicate your proposal in a formal way.
