When One Is Responding to a Crisis or Giving an Important

When one is responding to a crisis or giving an important announcement, which of the following is the most appropriate presentation method?

A) A presentation that is delivered extemporaneously
B) A presentation where a speaker reads a prepared speech
C) A presentation that the speaker recollects from memory
D) A presentation where the speaker improvises as he delivers the speech
E) A presentation with the use of placards and notes