Which of the following was the origin of today's marathons

a: the announcement of the athenian defeat at the battle of marathon

b: the announcement of the athenian victory at the battle of marathon

c: the announcement of the defeat of the persians at mount marathon

d: the announcement of the victory of the persians at mount marathon

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.