Astudent is preparing a speech on the migration of alaskan caribou. the student's purpose is to inform others about the great distances caribou must migrate in order to obtain sources of food. which visual aid will best support the author's purpose?
a. a map showing caribou migration
b. a visual of caribou herds migrating
c. a graphic of food sources for caribou
d. a photograph of caribou herds eating

The best answer is A, a map. The reason why is because since the student's purpose is to inform others about the great distances caribou migrate just to obtain food, a map showing how far the caribou migrates is going to best help the viewers understand the student.

C won't work because the student's purpose and the food sources doesn't relate to one another.

D won't work because once again, a photograph of caribou eating isn't going to help show viewers how caribou migrate great distances to obtain food.