A sample in which everyone in a population has an equal chance of being selected to the sample is known as a ________ sample.

A) biased
B) representative
C) stratified
D) random

A random sample is the best choice because it provides an equal chance of selection for all individuals in the population, reducing the potential for bias and improving the representativeness of the sample. A biased sample would not be representative of the population, and a stratified sample would involve dividing the population into subgroups and selecting a sample from each subgroup, which may not provide an equal chance of selection for all individuals.