Walmart Refuses to Stock CDs Bearing Parental Advisory Stickers for Explicit

Walmart refuses to stock CDs bearing parental advisory stickers for explicit lyrics or violent imagery.Recording artists who want their recordings available at Walmart have the option of altering lyrics and song titles or deleting offending tracks.Likewise,artists are sometimes asked to change album cover art if Walmart deems it offensive.Considering the elements of the five forces model this is an example of:

A) buyer power.
B) supplier power.
C) threat of new entrants.
D) threat of substitute products.
E) access to distribution channels.