Which of the Following Best Describes a Matched Pairs Experiment

Multiple Choice

Which of the following best describes a matched pairs experiment?

A) An experiment in which each observation in one sample can be matched with an observation in another sample.
B) A matched pairs experiments means that the samples are not independent.
C) We estimate the difference between population means by estimating the mean difference when the data are produced by a matched pairs experiment.
D) All of these choices are correct.