Correct option is C
The primary functions of mass media encompass informing the public, educating various audiences, persuading individuals or groups often as part of advertising or political campaigns, and providing entertainment. Mass media is a dynamic entity that contributes to societal change rather than making a society static, hence option A is not considered a main function. Therefore, the functions that mass media are known for are B (Inform), C (Educate), D (Persuade), and E (Entertain), which are all included in option (c).