"to inform my audience about the major theories explaining the extinction of the dinosaurs" is a specific purpose statement for a speech about a(n):

"To inform my audience about the major theories explaining the extinction of the dinosaurs" is a specific purpose statement for a speech about a): concept.

Explanation:

When speaking about concepts, you may have to find concrete ideas in order to make abstract ideas more relatable and tangible to your audience.

i will have to go with 1.

hope this !

it is grammatically incorrect and is illegible to me and i can not answer it.