Answer: Parents.
Step-by-step explanation:
Here, Sharon wants to estimate the percentage of parents that use cloth diapers.
i.e.Researcher = Sharon
Since Sharon will reach parents about her objective of whether they use cloth diapers.
So , Population = Parents
If She asks a randomly selected group of 75 parents whether or not they use cloth diapers , then Sample size is 75 .
Therefore, the population is : "Parents."