Which two cultural terms have the most similar meanings? a. acculturation and appropriation b. assimilation and appropriation c. acculturation and assimilation d. diffusion and assimilation

The two closest terms are  C. acculturation and assimilation.

Both terms refer to the process in which two cultures meet and interact and "borrow" some aspects of the other culture - the difference is that assimilation produces more similar culture.

In contrast appropriation is a one-way process: only one culture takes on the characteristics of another culture.

The saharan africa is desert not forest