Which was not a result of Japan's isolation during the seventeenth century? A. Christians were tortured and executed
B. Japanese people were prohibited from leaving the country
C. Japan lost all knowledge of European advances
D. most foreigners were expelled from the country

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.