To answer this question we need to remember the definition of both parameters and statistics:
• A parameter is a number describing a whole population
,
• A statistic is a number describing a sample
In this case we notice that the study was conducted to all 2004 voting adults, hence the value whatever it may be will be a parameter. Therefore we conclude that:
The value is a parameter because it is a numerical measurement describing some characteristic of a population.
And the correct option is C