Which of the following speeches is an example of a demonstration speech? a. “who was abraham lincoln” b. “the human brain and it’s many parts” c. “the creation of hollywood” d. “making irish soda bread”

The answer is D "Making Irish Soda Bread"

"Making Irish Soda Bread" is an example of a demonstration speech. The last option is correct.

A demonstration speech is a type of informative speech where the speaker's main intention is to teach the audience how to complete a task (or process), and this is achieved by demonstrating the task (or process) through a series of steps.

Demonstration speech topics abounds, including the following and many more:

How to prepare a recipe (as in standard cooking shows)

How to operate a software application

How to tie a knot

How to calculate a mortgage payment

How to swim the back stroke

The difference lies in the use of the prepositions- in vs on so “in” is used to express the time, place, or surrounded by something.
While “on” is used to express where the object is, a particular place, over a thing.
So for this instance, I’m in the gp means that you’re included in it. I’m on indicates that you’re using it. This is just my opinion to how I see it
Hope this helps :)