You Want to Target a Personal Appeal to an Individual

You want to target a personal appeal to an individual. For which reason might the telephone be preferable to sending an email?

A) It allows you to reach large audiences.
B) It allows you to include additional documents that may help your persuasive appeal.
C) It gives your audience time to consider your appeal before carefully responding.
D) It allows for immediate feedback so you can alter your appeal on the fly if necessary.
E) It makes it more comfortable for the audience to respond negatively.