The correct answer is C. Statistic.
A parameter is a numerical measure of a population characteristic. It is a fixed value that describes a population. For example, the mean height of all adults in the United States is a parameter.
A statistic is a numerical measure of a sample characteristic. It is an estimate of a population parameter. For example, the mean height of a sample of 100 adults in the United States is a statistic.
Inference is the process of drawing conclusions about a population based on information from a sample.
Sample parameter is not a valid term.
None of these is not the correct answer.