What was the most prevalent propaganda media form? a.) magazines b.) billboards c.) posters d.) movies

Option: C. Posters

Explanation:

Posters were the most prevalent propaganda media form because they communicated with people in history. Posters were put in the streets, shops, and public buildings where people can read it freely.  The posters were able to spread ideologies and inspire people. Propaganda was used to spread information in support of a cause, especially during World Wars. Posters helped people to get together for support, boost morale and urge action.

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.

food chain i would say only because there is competition on getting food and survival