Final answer:
The share of a television audience indicates the percentage of households using TV in a specified time period that are tuned to a specific program. It is important for advertisers to know the share of the television audience to understand the reach of their advertisements and target their advertising accordingly.
Step-by-step explanation:
The share of a television audience indicates the percentage of households using TV in a specified time period that are tuned to a specific program. This is option B. An example would be if there are 100 households using TV in a given time period, and 50 of those households are tuned to a specific program, then the share of the television audience for that program would be 50%. It is important for advertisers to know the share of the television audience to understand the reach of their advertisements and target their advertising accordingly.