Final answer:
OPtion C: Commercials became shorter because advertisers turned to shorter spots as a way of controlling their media costs.
Step-by-step explanation:
The correct statement about the length of television commercials is option C: Commercials became shorter because advertisers turned to shorter spots as a way of controlling their media costs.
In the earlier days of television programming, commercials were longer as advertisers had more airtime available. However, as advertisers began to focus on cost control, they turned to shorter spots which were more economical.
This trend of shorter commercials continues today, with many ads lasting just 30 seconds or even 15 seconds, allowing advertisers to deliver their message efficiently and effectively.