Answer:
A. households using television
Step-by-step explanation:
Households using television is a term used by Nielson Media Research to represent the total number of households that have their televisions on in a particular area compared to the total number of houses with televisions.
For example this can be calculated in a one hour period to see the percentage of households that watch television within that time frame.
Rating on the other hand calculates number of households watching a particular programme.
The formula for this is
Household using television = Rating ÷ Share