Answer: Option A
Step-by-step explanation: In simple words, use of E-mail for spreading any formal information is an example of indirect communication in which no face to face interaction between the sender and the receiver takes place. By sing an e-mail the manager can spread the message more effectively and efficiently and would save time.
However face to face interaction is considered more appropriator in formal communicative so as the receiver can ask some queries that he or she have and the sender can also study the body language and the reactions of the receiver which can help in further decision making.
Hence the correct option is A.