Answer:
A. All seventh grade students at Wood Middle School
Explanation:
We want to find which is the population.
Now, A population is simply the entire set or group that you intend to find out information and draw up a conclusion while sample is the specific set or group derived from that population from which we collect data.
Thus implies that the population size is always more than the sample size.
In this question, from the definition we have given, we can easily see that the population is the 300 seventh grade students at Wood Middle School while the sample is is the 100 seventh grade students that were surveyed.