A researcher posts a newspaper advertisement offering $20 in exchange for participation in a short study. The researcher accepts
the first five people who respond to the advertisement. Which of the following statements is true about the sample? A.
It is not a valid sample because it is only a short study.
B.
It is a valid sample because money was offered to participants.
C.
It is a valid sample because the first five people were selected to participate.
D.
It is not a valid sample because it is not a random sample of the population.
the length and 
the width. By the ratio of the sides:
. Then: