Answer: The value is a statistic.
The question states the results of a nation-wide survey.
In statistics, ‘survey’ refers to an investigation of a sample with the intention of collecting information about the population by using statistical methods. A value that describes a sample is known as a statistic.
A ‘population’, on the other hand, is the whole. It includes every single person who is a part of a group. A value that describes the population is known as a parameter.
In this question, the population consists of all high-school students (grade 9 to grade 12), irrespective of whether they were a part of the survey.
Since the survey essentially works with a sample from the entire population, and the data given in the question (25% of respondents reported that someone had offered, sold, or given them an illegal drug on school property), is derived from (describes) a sample, the given value is a statistic.