Answer:
<em><u>C. The process of knowledge, skills, and technology being spread from one culture to another</u></em>
Explanation:
<u>Diffusion</u> refers to the knowledge, abilities, and technological advancements that are transmitted <u>between cultures</u>, adopted and added into their own.
<u>Diffusion</u> occurs through <u>trade</u> (when goods are included and embraced by a different culture), <u>migration</u>, or when people <u>travel</u>, which makes them learn and adopt foreign traditions.