Oprah Winfrey is classified as one
I think this refers to the Soviet Union in WW2: It was almost taken by the Nazis in the time from October 1941 until February 1942, but it wasn't and it later took Berlin at the end of the War.
Answer:
Population.
Explanation:
When conducting a study, we say that the population is the complete set of people with some specific characteristics from which a sample will be taken.
A sample is the subset that is taken from the population and the sample is the one that is actually selected for study purposes.
In this example, <u>Professor DeVries interviewed 50 of the school students (sample),</u> thus, all the children attending the school would be considered to be the population since the subset of 50 students was taken from it.