(a) The five factors influencing the choice of advertising media are: 

1. Nature of the Product: The product to be advertised is the main determinant of the advertising medium. Consumer Goods have a general and wide appeal. On the other hand industrial goods can be advertised better in specialised trade, technical and professional journal. 

2. Nature and Size of the Market: The geographical location or region, size of population and its purchasing power should be considered before Reflecting the media of advertisement. 

3. Objects of Advertising: The objectives of the advertising campaign are very important in deciding the medium of advertising. 

4. Circulation of Media: Newspapers and other media having wide circulation are useful when the message is to be conveyed to a very large number of people. 

5. Media used by Competitions: The media used by the suppliers of competitive or substitute products also influence the choice of the medium of advertisement. In order to face competition, it becomes necessary to advertise in media adopted by competitions. 

(b) The two basic elements of Human Relations are: 

1. Persuasion is an important element of public relations. It is through some kind of communication that persuasion takes place. To persuade means to convince another person of same idea, product, service or institution, to induce a person or group or to do something. We are all engaged in persuasion. 

2. Dialogues means a conversation between two persons with a purpose. If a person goes on talking without allowing others to participate in the discussion or talk, then it becomes a monologue. Democracy and freedom cannot survive without discussion and debate. In a dialogue each person presents facts and views and considers the facts and views presented by others.