Answer:
d.allowing her to evaluate her boss's body language before suggesting she was ready for a raise.
Explanation:
There are several ways of communication between two or more people. Email is a non-presential communication tool that can be very useful in many situations, especially when there is a physical distance between the interlocutors. Verbal communication is direct, face to face. It is a form of communication where people can evaluate each other's body expressions and signals. That way, if Jane had personally asked her director, maybe she could assess if this was the right time for that. If the boss was clearly annoyed, it would be better to wait. If he was happy, maybe it was the right time. By email it is not possible to make this assessment.