D. Some speeches are delivered extemporaneously

In popular usage, “extemporaneous” means the same as “impromptu”. But technically the two are different.

1. Extemporaneous speeches are carefully prepared and practised in advance.

2. They are presented from a set of notes, but the exact wording is chosen at the moment of delivery.

3. There are several advantages of extemporaneous delivery.

a. It gives greater control over ideas and language than impromptu delivery.

b. It allows for greater spontaneity and directness than memorized or manuscript delivery.

c. It encourages conversational vocal qualities, natural gestures, and strong eye contact. Conversation quality means that no matter how many times a speech has been rehearsed, it still sounds spontaneous to the audience. When you speak extemporaneously – and have prepared properly – you have full control over your ideas, yet you are not tied to a manuscript. You are free to establish strong eye contact, to gesture naturally, and to concentrate on talking with the audience rather than declaiming to them.