What is/explain the diffusion of popular culture using the concept of hierarchical diffusion? can someone pls help me??

Hierarchical diffusion is when a cultural trend is spread from one segment of society to another in a pattern, such as hip hop spreading from cities to less populated areas. Stimulus diffusion is when a cultural trend spreads but is changed by those adopting the idea, such as American practitioners of yoga poses

Explanation:

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answer; (d) melting of sea ice;