Choose the correct answer below.

A. A sample is a set of measurements that are recorded on a naturally occurring numerical scale. A population is a set of measurements that cannot be measured on a natural numerical scale; they can only be classified into one of a group of categories.
B. A sample is a set of units of interest to a study. A population is a subset of the units of a sample.
C. A population is a set of units of interest of a study. A sample is a subset of the units of a population.
D. A population is an object upon which data is collected. A sample is a characteristics or property of an individual experimental unit.