The statistic below shows the rise in advertising in the 1950s:

Spending on advertising in 1950: $5.7 billion
Spending on advertising in 1960: $11.9 billion

Source: http://www.shmoop.com/1950s/statistics.html

The increased use of which technological development played a key role in the rise of advertising?

automobiles
television
jet airliners
recording methods