Answer: The speaker is using Extemporaneous speaking style
Explanation: Extemporaneous speaking is the delivery of a well prepared written speech that has been practiced, delivered in a conversational style while using minimal notes. The extemporaneous speaker can make and keep the audience's eye contact by using notes rather than a complete piece of writing. This also allows them to gauge whether the audience is understanding the speech as it goes along. The chance to evaluate also presents a chance to clarify whatever idea or concept that the audience appears to be having problems understanding.