Final answer:
Jason's speech is likely an extemporaneous speech as he has conducted detailed research and plans to use notes for reference, which supports a natural and well-organized delivery on the subject of global warming to his audience.
Step-by-step explanation:
Jason's speech will most likely be a c. extemporaneous speech, given he has prepared detailed research and plans to use speaking notes to help him remember key ideas and citations. Extemporaneous speaking involves delivering a speech in a conversational manner using notes or an outline, rather than reading word for word from a script or speaking completely off the cuff without preparation, which would be indicative of a scripted or impromptu speech, respectively. This type of speech allows for a more natural delivery while still being well-organized and informative, which is effective for engaging an audience on complex topics like global warming.
In the context of the provided examples, Shawn Krukowski's proposal on climate change and the advice on speaking from an outline to ensure a natural and smooth delivery further support the categorization of Jason's speech as extemporaneous. This delivery method will enable Jason to connect with his audience of approximately 50 people and communicate the importance of global warming and its solutions in a more direct and personal way.